Difference-making players aren't traded for linebackers coming off of an ACL injury. They're just not.

LeSean McCoy might have had a big cap number in 2015 and (allegedly) had a bad attitude to go with a sub-standard campaign, but if Chip Kelly thought McCoy was a difference-maker for his team then he would have dealt with all of that to have that guy on the field for 300-plus carries, just as he had the past two seasons.

Obviously, he didn't value McCoy the way the Fantasy Football universe values McCoy. That means either we as football fans are overvaluing McCoy -- or Kelly is undervaluing McCoy.

We can all look back on Shady's 2014 and blame Darren Sproles and Chris Polk for stealing 10 touchdowns and 42 catches. But McCoy earned every bit of that 4.2 rushing average. And while a guy like, say, Fred Jackson would kill for a 4.2 rushing average, it tied a career-low for McCoy.

The O-line in Philadelphia was an obvious factor, but I also think defenses were comfortable stacking the box to contain McCoy, effectively daring Nick Foles/Mark Sanchez to throw on them, especially without a devastating deep threat like DeSean Jackson on the field. But ultimately, I think McCoy just wasn't as good as he was in the past. He had 312 carries last year to break out of whatever funk he might have been in. He had some great games but he didn't play like one of the very best at his position. He hit 10-plus Fantasy points in half of his games and averaged just less than 10 Fantasy points per game. That's great for Fantasy, but it's not Top-5 pick good. 

Now before you start thinking that he's going to roll into Buffalo and pick up all the carries he would have had in Philly plus all the catches, get to know his offensive coordinator a little bit. Greg Roman's track record proves he loves to run the football -- right up there with Rex Ryan -- but his running backs didn't get a lot of receptions in San Francisco. Maybe that changes now that he has McCoy at his disposal, but that would go against four years of his history. 

But it's not like McCoy's going from a pass-oriented offense to a run-oriented one. Philly's offense revolves around the run game. So it's not really a major philosophical change. 

Tack on the rest of the Bills offense and it's concerning. The O-line wasn't very good (they allowed 39 sacks and ranked among the worst in the league on ProFootballFocus.com) and the quarterback situation is worse than Philly's ever was last year. Even with Sammy Watkins on the field, defenses will key in on McCoy and dare EJ Manuel to throw on them. Also, Fred Jackson might be old and slow but he, for now, has to be factored into the game plan. Don't think for a second that he'll vulture some touchdowns from McCoy.

I'm concerned. Not saying I would totally pass on McCoy. Just saying I'm concerned. As of now, I'm not sold on him as a first-round pick. Second round? Sure, but there will be someone in my league who takes him before I would.