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LeSean McCoy trade highlights high-risk, high-reward Bills offseason

With offseason workouts and minicamps in the rearview mirror and training camps just a few weeks away, we assess the Buffalo Bills' offseason moves and assign a letter grade in the video above.

Best move: His off-field chatter aside, LeSean McCoy was one of the highest-profile players to change teams this offseason. Sure, he had a "down" year last season, but he still gave the Philadelphia Eagles nearly 1,500 all-purpose yards. The Bills' running game was a weakness of the team last season, and McCoy gives them a chance to be among the league's best. Plus, it's hard to say the defense will take a step back without Kiko Alonso when he didn't play a down last season. As long as McCoy's production doesn't plummet this season, this was a solid trade.

Riskiest move: The Bills checked off all the boxes under "taking a risk" this offseason. Overspending to acquire a player? They did that with tight end Charles Clay and his deal that included $24.5 million guaranteed. Signing players with off-field issues? They did that with guard Richie Incognito and wide receiver Percy Harvin. Drafting a player with off-field concerns? They did that with running back Karlos Williams, who was investigated for domestic assault last year. Yet the move that might carry the most risk is signing McCoy to a five-year, $40 million deal with $26 million guaranteed. The trade itself was an exercise in finding good value, but it might be tough for McCoy, who turns 27 next month, to live up to that deal.

Thin up front: For all the spending the Bills did this offseason -- they doled out more guaranteed money ($91.5 million) than any other club -- they didn't address their offensive line deficiencies beyond signing Incognito and drafting John Miller. They tried to sign Bryan Bulaga and tried to trade for Jahri Evans, according to reports, but fell short in both cases. The result is an offensive line that has potential to be better than last season -- especially if Incognito and Miller are an improvement over Chris Williams and Erik Pears -- but there is still a downside that could leave the group among the league's worst again this season. That will have a negative, trickle-down effect on whoever is the starting quarterback.

Training camp outlook: Collecting first-round talents such as Sammy Watkins, Stephon Gilmore, Mario Williams, Jerry Hughes, Marcell Dareus and McCoy in recent seasons has put the Bills in as good of a spot as they have been in for more than a decade. They've gone from having a below-average -- and at times, worse -- roster to stacking up well against most teams in the NFL. The transition to Terry Pegula and Rex Ryan has brought optimism to a beleaguered franchise, which has created an excitement among the fan base. If it all comes together this season, it will be a remarkable turnaround in one of the NFL's smallest markets. Yet if the Bills fall short again this season -- the word "quarterback" still makes people around the team squirm -- what will be the next move?