The NFL draft is April 28-30. Combine and pro days are over, leaving only individual predraft workouts and visits before the big event for prospects.

The Broncos have made moves to bolster their roster, but key contributors can always be found in the draft.

Here is the second edition of my mock draft:

Round 1, pick 31: Robert Nkemdiche, DE, Ole Miss; 6-foot-3, 294 pounds.

My last mock draft had the Broncos taking Michigan State quarterback Connor Cook with the first pick, and I still believe that’s a reasonable possibility. But I’m starting to get the feel he may not even be there when Denver selects at No. 31. There are always more quarterback-needy teams than there are quarterbacks.

With this selection the Broncos reel in Nkemdiche, one of the most talented, yet polarizing prospects in the NFL draft. He shows incredible power, explosiveness and a relentless presence in opponent’s backfields — 26 quarterback pressures in 2015.

Nkemdiche has off-the-field issues involving an arrest for marijuana possession when he fell out of a hotel window before the Rebels’ bowl game. His talent also didn’t quite match his production — seven sacks over three years. He worked primarily as the Rebels’ defensive tackle, but likely would be a defensive end with the ability to move inside on the Broncos’ defense.

“Just watch his Alabama tape against the best team in college football, he was dominant,” Mike Mayock of the NFL Network said in February. “Off that one tape, if he didn’t have any off-the-field issues and if he’d played that hard every week, we’d be talking about him as the first pick in this draft.

“That’s how talented he is, and that’s how much upside he has. However, once you factor in the inconsistency from snap to snap and game to game and the off-the-field situations, then you get into, how do you measure this kid? At what point does the risk justify the reward?”

At No. 31, the reward of getting a top-five talent might justify the risk. The Broncos have the sort of coaching staff and locker room that helped get outside linebacker Von Miller back on track; can they do the same with Nkemdiche?

Previous pick: Cook

Round 2, pick 63: Dak Prescott, QB, Mississippi State; 6-2, 226.

Prescott was an athletic playmaker in college, throwing for 3,793 yards, 29 touchdown and five interceptions. He also rushed for 588 yards and 10 touchdowns during his senior season. He showed dramatic improvement in throwing mechanics throughout his college career transitioning from a red-zone running quarterback to an accurate pocket passer, completing 66.2 percent of his passes his senior season.

He was arrested for driving under the influence in Starkville, Miss., two days after his pro day.

Prescott would be a good fit in Gary Kubiak’s system, and the Broncos had him in for a predraft visit at the beginning of the month. He’s a bit raw, so he might not be able to start from Week 1.

With a year or two of seasoning and footwork improvements, Prescott could become Denver’s franchise quarterback. Former Eagles quarterback and ESPN analyst Ron Jaworski compared Prescott to a young Donovan McNabb coming out of Syracuse.

Previous pick: Adolphus Washington, DE, Ohio State

Round 3, pick 94: Dominique Alexander, LB, Oklahoma; 6-0, 232.

The Broncos’ most underrated departure this offseason is linebacker Danny Trevathan, Denver’s leading tackler two of the past three seasons. Late on day two of they draft, they select a potential replacement.

Alexander was one of the best coverage inside linebackers in college football last season. He allowed only 13 receptions for 141 yards on the season or one reception per every 34.5 plays in pass coverage, according to Pro Football Focus.

A bit undersized for a 3-4 inside linebacker seems like a broken record with all of the Broncos’ players at the position. If he can show the strength and ability to get off blocks consistently, Alexander could compete for a starting job with Todd Davis, Corey Nelson and Zaire Anderson.

Previous pick: Christian Westerman, G, Arizona State

Round 3, pick 98: Justin Simmons, S, Boston College; 6-2, 202.

Simmons is the perfect example of a do-your-job player who would fit well in the Broncos’ no-fly zone. His size, speed and athletic ability were apparent when Simmons shined at the combine, but put on the tape and those traits hold up.

He’s a character guy, who played a lot of the deep safety role for Boston College’s No. 1-ranked defense. He has cornerback and safety experience, but fits best as a free safety in the NFL. He made five interceptions and forced two fumbles in 2015.

Simmons would give the Broncos much-needed depth behind T.J. Ward and Darian Stewart as the team’s third safety, with a good chance of immediately playing the role David Bruton played on defense and special teams last season. The Broncos expressed interest in Simmons at the combine.

Previous pick: Paul Perkins, UCLA

Round 4, pick 136: Spencer Drango, G-OT, Baylor; 6-6, 315.

Drango’s accomplishments are about as good as any offensive lineman in this draft. He was a four-year starter at left tackle for the Bears and won Big 12 offensive lineman of the year in 2014 and 2015. He also was named an All-American during his junior and senior seasons.

The problem comes when looking to project him to the NFL. He might have to switch to guard because of a lack of athleticism and lower body strength.

This is one where you hope the tape tells the truth and you get an immediate key reserve who can compete for a starting job at guard or right tackle. Drango didn’t allow a sack last season, according to PFF.

Previous pick: Miles Killebrew, S, Southern Utah

Round 5, pick 145: Rashard Robinson, CB, LSU; 6-1, 171.

Once you get into the third day of the draft, teams are more likely to draft for potential. Cornerback might be the deepest position on the Broncos’ roster. But there’s always room for guys who can play.

Every year teams go in looking for a guy in the later rounds who could be a future star. Robinson could be that kind of player. He hasn’t played organized football in two years after being kicked off LSU’s football team in 2014 for multiple violations of team rules.

Robinson has starting cornerback potential. He showed off strong man-to-man coverage skills as a freshman and sophomore with the speed, length and athleticism NFL teams salivate over. He ran the 40-yard dash in 4.49 seconds at the combine, then in 4.43 at LSU’s pro day. He visited with the Broncos at the combine and on a predraft visit last month.

Previous pick: Tajae Sharpe, Massachusetts

Round 5, pick 157: Ben Braunecker, TE, Harvard; 6-3, 250.

This isn’t a great draft for tight ends. There might be fewer than 10 tight ends drafted, and none of them really has star potential.

Braunecker is intriguing. He dominated his competition with 48 catches, 850 yards and eight touchdowns as a senior, but played in the Ivy League. The biggest question is how he can adjust to NFL linebackers and safeties. He ranked in the top five of tight ends in nearly every significant testing category at the combine.

His best skill set is as a receiving tight end, but if he can play fullback, it would allow the Broncos to fill two spots with one player and give him a better shot of making the team.

Previous pick: None

Round 6, pick 219: Tyler Ervin, RB, San Jose State; 5-10, 192.

The Broncos don’t need a bell cow now that C.J. Anderson is locked up long term, but they could use some depth and explosiveness out of the backfield.

Ervin provides a triple threat as a runner, receiver and returner that teams often seek out of third-day prospects. He could excel as a quick, shifty change-of-pace back. Ervin is a smart runner and a lot more physical than his body type would indicate.

He also returned three kickoffs for touchdowns in two seasons.

Previous pick: Terrance Smith, Florida State

Round 7, pick 228: Farrington Huguenin, DE, Kentucky; 6-4, 282.

Why not grab another player at the deepest position in the draft? Huguenin likely won’t be a star, maybe not even a starter, but if he makes the team he could provide depth, especially as a run stuffer at defensive end.

He flashed his athleticism and power at times, but Broncos defensive line coach Bill Kollar could get the most out of him as a practice squad player or rotational defensive end if he were to make the 53-man roster.

Previous pick: Anthony Zettel, Penn State

Round 7, pick 253: Max McCaffrey, WR, Duke; 6-2, 200.

Another McCaffrey in Denver, this time as Mr. Irrelevant. The last name is sure to conjure up exciting memories. Max can play. The former Valor Christian star showed off good hands and reliability as a three-year starter for the Blue Devils. He led Duke in receptions, receiving yards and receiving touchdowns last season.

McCaffrey ran the 40-yard dash in 4.4 seconds at his pro day. He’s another player who could secure a practice-squad spot or possibly steal a spot on the final roster with an impressive training camp.

Previous pick: Tre’von Stewart, Houston

Cameron Wolfe: cwolfe@denverpost.com or @cameronwolfe