The way he plays, he cuts like a maniac jitterbug. If he's hesitant at all, I'd rather see Edelman out there. I'm not sure if it's all knee injuries, or just the two ligament tear types, but full (for WR, RBs)recovery doesn't happen til the second year according to experts. That means, even if healthy, the elasticity and flexibility aren't there for a full year, year and a half.
If we get a Welker, that's cautiously cutting, we don't have what we know as Wes Welker. Obviously, the team is going to do what they're going to do, but i would be cautious for any player who depends on crisp, sharp cuts.