The New York Giants are big winners in the aftermath of the Washington Redskins getting fleeced by the Kansas City Chiefs in the NFL's first blockbuster trade of the 2018 offseason.

The Redskins dealt a third-round pick and their best young defensive player (Kendall Fuller) on his rookie contract for aging veteran quarterback Alex Smith. Immediately after the trade details were revealed, it was announced that the Redskins would also sign Smith to a contract extension worth $91 million over four seasons with $71 million in guaranteed money against the salary cap. Smith's contract will now run through his age-38 season. The Redskins went all in for a quarterback who just had a career year at 33 years old behind a strong offensive line, with a breakout rookie running back (Kareem Hunt), the NFL's second-best tight end, the NFL's top deep threat, and an offensive coordinator who did such a great job that he was just hired as the Chicago Bears head coach.

The Giants have certainly found success against Cousins, even while starting street free agents like they did in their Week 17 win in 2017, but they've found even more success against Smith. Smith has a career 2-2 record against the Giants but it has nothing to do with him. Smith has thrown for just 960 passing yards in four games with four touchdowns thrown and eight interceptions. The Chiefs came into MetLife Stadium this season against a lifeless and injured Giants team with lame-duck head coach Ben McAdoo and Smith managed to blow the game where a late-game interception thrown to Janoris Jenkins had a major impact.

The worst part of the trade for the Redskins wasn't even the fact that they essentially swapped out a 29-year-old Kirk Cousins in his prime for an older and less effective version in Smith. It wasn't even the fact that they re-signed Smith to a massive contract extension that should put them in salary cap hell. Dumping a valuable asset like a third-round pick also wasn't their fatal flaw. It was the decision to part with Fuller that will haunt the franchise for the next decade. Fuller finished as Pro Football Focus' fifth-best cornerback in pass coverage overall and their second-best slot cornerback overall in 2017. Fuller is still just 22 years old and coming off a breakout season in 2017. He is also under contract for cheap and team-controlled through the 2019 season.

Kendall Fuller was @pff No. 2 slot cornerback in 2017. He is under contract for two more seasons with a cap hit of $657,500 in 2018 and $750,000 in 2019. The #Redskins actually traded this kind of asset away. There is no explanation that makes any sense for doing that. — Dan Schneier (@DanSchneierNFL) January 31, 2018

Fuller did an excellent job against Giants slot wide receivers this season by taking away Eli Manning's underneath threat. Throughout his career, Manning has leaned on his slot wide receiver, especially on third downs. With Fuller now out of the picture with the Redskins, the Giants passing game should find more options against a Redskins defense they struggled with during their two meetings in 2017.

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And with this huge mistake by the Redskins, the Giants immediately take a step forward in the NFC East — without lifting a finger yet, roster-wise.