Jamal Lewis tore his ACL, and came back the next year with better numbers. I believe Jamal Anderson and Edgerrin James both had torn ACL's as well, and while they didn't return to form that next year, they both were right around 1,000ru yds.
It all comes down to Risk vs Reward. Drafting solid guys like Mason won't lose it for you, but they aren't going to win it either. Drafting a guy like Walker, who looks very good in camp, and who will have had a full year to recover by game day....well, those are the guys that could present great value if they return to form. Guess it comes down to how much you like to gamble.
This line of thinking about "upside" is just wrong. Last year for example Roy Williams and Michael Clayton had this mysterious "upside" while guys like Joey Galloway, Steve Smith, and Santana Moss were solid performers but weren't going to win the league for you. Same thing with Mushin Muhammad two years ago. Or for an example at RB, Curtis Martin 2 years ago or Tiki Barber last year.
Steve Smith wasn't solid. He was...coming off a leg injury and caught one pass the season before. In 2003, he was one of the top WR's the latter part of the year. He wasn't solid, he showed that he had the potential to be one of the top receivers in the league. But people were worried about how he'd be since he caught one pass the year before. He's a better argument for my side of the coin. He went in the fourth round of my draft last year.Galloway has been injured for like...a decade. He was always injured, not solid. Was he even drafted in your league last year? He was in mine, I drafted him in the 14th round.
S. Moss wasn't solid. He had one good year, then a crappy year and people got down on him. Then he got a change of scenery and became good again.
Muhammad would be the closest I guess, but he only had one decent year before he had his little breakout season. Not what I'd call consistently solid.
None of these guys fit the bill for that argument...at all. Mason has been doing the 1100/7 thing for what, like five years now?
Curtis Martin and Tiki Barber would be the closest. But they were both 2nd round picks in most drafts anyway. I mean, most players coming off major injuries that you'd take a chance on...aren't going in the first two rounds.
As for upside? Clayton and Roy both sucked, sure. But you know as well as I do that I could rattle off a ton of names of guys players people took risks on that panned out. The guys with upside. Take the most obvious choice, LJ last year. Those are the guys that win people leagues. And yes, when you miss, they can lose it for you to.
But Mason...hey, I like the guy. I used to draft him. But he never did anything more than he was expected to. If you don't want to take risks, he's a great play. But he's not a pick that you'll find a lot of value in. He's going to do exactly what you expect. Taking a risk on a Walker type means that...he could not even see the field, or he could go off for 90/1400/12 (I highly doubt it though, but that's what he did in '04).
Walker is like playing dollar slots. You might win, and you have a high chance of losing as well. Mason is like playing the change machine. You know you're getting four quarters out of that sucker, and while you won't end up behind...it won't get you ahead either.