By James Kratch | NJ Advance Media for NJ.com

Good Sunday morning. Time for another Giants mailbag, the first one in July as the countdown to training camp - 25 days to go - is in full swing.

In this week's mailbag: A look at which opposing position group will be the toughest for the Giants in 2017, undrafted rookie Travis Rudolph's chances to make the team, future salary cap talk and more. Here we go ...

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What's the best position group the giants will face this season — tim (@nygtim) June 29, 2017

The best opposing position group the Giants will face in 2017 is the Cowboys' offensive line, but that won't necessarily be the opposing position group that gives the Giants the most trouble. On that front, I keep coming back to the Giants' Week 5 game at home against the Chargers.

The Giants' main team weakness is their offensive line, specifically the tackles. And they're going to have their hands full with Joey Bosa on one side and Melvin Ingram on the other. That has the potential to be a rough, rough matchup for the Giants. They will see a slew of star pass rushers this season, but the double-whammy the Chargers present could be big trouble.

Other matchups that come to mind: The Broncos' overall defense, the secondary in particular, as well as the Chiefs' defense and the Raiders' offensive line. The Eagles' offensive line and pass rush could also be a handful as well. But for the toughest test, I'll go with the Chargers' defensive line.

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The Chargers' defensive line will be a challenge for the Giants. (Jake Roth | USA TODAY Sports)

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Do you see Bobby Hart and John Jerry holding on to their starting positions? Or does DJ Fluker win a starting job? — Edward Cabarrubia (@edwardprc) July 1, 2017

It would be a major surprise if John Jerry loses the starting right guard job, even though Fluker has started out working as the second-team right guard. Jerry is coming off his best season as a Giant, he just received a three-year, $10 million extension and he's started all 16 games in two of his first three seasons with the team. Jerry also has a deal that would require the Giants to take a salary cap bath if they had to cut him this year.

It's possible the Giants could eventually see what Fluker can do at right tackle – he played the position in his first two seasons with the Chargers – but they seem optimistic about Bobby Hart. They have praised his offseason work with Ereck Flowers, and they would like to see him win the job. Hart kind of crashed and burned at the end of last season, but he had a stretch earlier in the year where his play was solid. It's been said before here, but there's a strong argument Hart showed more tangible on-field progress in his second year than Ereck Flowers did at left tackle.

Rookie Adam Bisnowaty could also be in the mix for the right tackle job if it ever gets to a true competition. Last year, McAdoo said Hart was competing in camp with Marshall Newhouse, but that was just talk. There was never a true battle afoot. It could be the same situation this summer.

One last note on Fluker: He’s a backup right now, and there’s no guarantee he’ll make the team. The Giants only guaranteed him $1.5 million, and they’d save $1.5 million in cap space if he’s cut at the end of the summer. If Adam Gettis outplays Fluker, or Chad Wheeler or Jessamen Dunker turn in a sensational preseason, Fluker could end up being an odd man out.

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McAdoo calling plays? — Miguel Mateo (@Ganas39) July 1, 2017

McAdoo will likely do his play calling song-and-dance again this summer. But yes, he will be calling the plays. He’s made it very clear he feels the best thing for the Giants is for him to call then. Co-owner John Mara is deferring to his wishes, even after last year’s significant step back by the offense. If the Giants are that bad again in 2017 though, McAdoo may have a hard time holding on to play calling duties in 2018.

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Which new additions are absorbing the schemes, which are not?

Also, my obligatory question about the likelihood of Travis Rudolph's chances. — Sean (@DailyChef7) June 29, 2017

On the first part, it’s too early to tell. We have yet to see any of the new guys on the field consistently, or playing time doled out in game settings.

As for Rudolph: He has a shot, but he will have to really battle for it. Rudolph is a great kid with a very compelling personal story. He's incredibly easy to root for, and many are doing just that. He's also at one of the deepest positions on the team, and he's got a lot of guys ahead of him at the moment. The Giants carried six wide receivers last year. Rudolph is probably eighth on the depth chart right now.

Rudolph, Roger Lewis and Darius Powe are likely competing for one spot. Sterling Shepard, Brandon Marshall and Beckham are locks; Dwayne Harris and Tavarres King are close to locks. There’s no guarantee the Giants carry six wideouts either – the addition of Evan Engram could change the calculus and swing an extra body to the tight ends or elsewhere. Rudolph’s potential as a punt returner should also be view somewhat skeptically. He worked there in the offseason program, but he wasn’t considered a quick guy in short space entering the NFL Draft.

Rudolph has the ability to be a contributing receiver in the NFL, but that may not be enough to crack this Giants receiving corps if everyone stays healthy.

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Many are excited about undrafted rookie Giants wide receiver Travis Rudolph. (John Munson | NJ Advance Media for NJ.com)

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Why do UFA SIGN WITH GIANTS WHEN THE GIANTS ARE VERY STRONG AT THE POSITION THEY ARE TRYING TO MAKE. WHY NOT OTHER TEAMS — ronald lukoff (@riluke1) July 1, 2017

Ronald is FIRED UP for this mailbag. That’s what I like to see! It’s a good question, too, and there are plenty of examples (not just with the Giants) of good young players who seem to have too many established players in front of them at their position where they are, but they’d be near the front of the line elsewhere. Rudolph is one of them.

Unfortunately there’s no good answer. There are many factors that could play into an undrafted player’s selection process if he has multiple teams interested in him.

Players and their agents definitely pay attention to each team’s depth chart when trying to find a new home. Money is also considered. In the case of undrafted rookies, the guaranteed money (usually via a signing bonus) can play a major role in decision-making. As can plenty of other things – familiarity with the coaching staff, location, agent-front office relationship, even an old-fashioned recruiting effort. It’s different for every player.

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Should the Giants sign a veteran corner in case Valentino Blake doesn't pan out? I know Michael Hunter has been looking great so far — Alex Wilson (@AlexxxWilsonnn) June 30, 2017

Any rumors of adding veteran cornerback depth before camp starts? — Frank Gionni (@fgionni19) June 29, 2017

This was the lead focus of last week's mailbag, with Darrelle Revis and Alterraun Verner as the main possibilities discussed. The in-depth rundown can be found here. The cliff notes version: Cornerback depth is definitely a concern for the Giants. Losing Coty Sensabaugh to the Steelers was a much bigger blow than most realize. It's possible the Giants will move to add a corner later this summer. Don't count on it, though.

The available options aren’t that great. If they were, they’d already have signed with the Giants or another team. Moreover, adding a veteran corner guarantees nothing – for example the Leon Hall signing last year was, on the whole, a bust – and the Giants have made it clear they want to let their young players play.

Valentino Blake will get the first crack to be the No. 4 corner, but with just $20,000 guaranteed to him before Week 1, nothing is a given for him. Michael Hunter had a strong offseason program. Donte Deayon will also get a shot, as will undrafted rookies DaShaun Amos and Nigel Tribune.

Mykkele Thompson cannot be forgotten either now that he appears to have moved over from safety on a permanent basis. If he’s healthy – and that’s a major if – he has a better chance of making the team than not making it. The Giants appear to like what they’ve seen from him in his limited reps, and his position versatility helps.

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How is Eli M feeling this year physically? Could he go for 2+ more seasons? — Ciarán (@crackedupcorson) July 1, 2017

Dan Duggan spoke to Manning recently on this very subject. You can find that interview here. He says he doesn't have a timetable and he feels great. Considering he has yet to show any clear physical decline, I don't see why he couldn't play out his current contract, which ends after the 2019 season when he's 39. Beyond that, though, is anyone's guess.

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Can the Giants push money to the back end of contracts since they will most likely only being a QB 20m+ for the next 3 years at most? — Timbs on a Boat (@reachbaclike13) June 30, 2017

There will be a lot of Giants salary cap talk in the months to come with center Weston Richburg, left tackle Justin Pugh, wide receiver Odell Beckham Jr. and safety Landon Collins all set to become free agents in the next two years.

The Giants did not move to restructure any of their big contract players this offseason, so it’s unlikely they would change anything for this season. Eli Manning will only have two years left on his deal after this season, so any changes to his deal would likely include his compensation being reduced (unless the Giants tack an extra voidable year, or something like that, for salary cap purposes).

The Giants could move to convert a portion of base salary to signing bonus money with some of the other big money players like defensive ends Jason Pierre-Paul and Olivier Vernon, cornerback Janoris Jenkins and defensive tackle Damon Harrison. By turning salary into signing bonus, that allows the Giants to spread the money over the remainder of the contract for cap purposes.

If the Giants go that route, Pierre-Paul and Vernon would be the most likely candidates, since they have the most guaranteed money coming their way after 2017. However, both players already have large cap hits, and they’d just get bigger down the road as their contracts progress, with more potential dead money lying at the end of the road if they do not finish their deals.

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JPP and OV could be prime candidates to have their contracts reworked after this season. (Bill Kostroun | AP Photo)

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Harrison only has $3 million in guaranteed money left after this season, while Jenkins will have no guaranteed money left. The Giants could also approach one or both players and offer them a pay cut in favor for guaranteeing more of their 2018 salary.

There is also the real possibility that, if the Giants are pent up for cap space in the next few years, they could cut one or more of their big name defenders. Harrison and Jenkins have deals that can easily be dumped after this season; Pierre-Paul and Vernon could go after 2018.

The Giants could put the post-June 1 cut rules to particular effect if they take that route. The cap savings wouldn’t happen in time for 2018 free agency, but they would be there by the summer of 2018 and into 2019, which is when the Giants will likely get serious about Beckham and Collins extensions. They should be able to handle Pugh and Richburg with whatever cap space they are set to have next offseason.

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So when does Missy Elliott name-drop Aldrick Rosas in a song? — Dan Karkotsky (@dkarkots) June 30, 2017

Dan is referring to Nicki Minaj mentioning Giants punter Brad Wing in one of her recent singles. And make no mistake about it: Long snapper Zak DeOssie is getting name-dropped by a rapper before kicker Aldrick Rosas. Rosas will be waiting a while. So will DeOssie.

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James Kratch may be reached at jkratch@njadvancemedia.com. Follow him on Twitter @JamesKratch. Find our Giants coverage on Facebook.