Wallace is a one dimensional deep threat, which is great to have, but once a player like Wallace loses a step and he can't just blow by people anymore, he's pretty much useless, whereas a BIG WR like Marshall can continue to play at a high level past his prime. Not when he's shot, but when he still has enough left in the tank to use his size and strength to make plays. Thats why the Marshall trade was a better one for us in my view. Also he's just better than Wallace.