I get the caution. It seems anyone coming off knee surgery takes time to get back to 100% even after they are cleared to play. I am not sure Gallup is a good example because some of his lack of production has been Kellen Moore who admitted as much.
But who is an elite wide receiver who tried to return after knee "revision", like OBJ? To say no one has ever come back successfully is an interesting point, but are we talking about a sample size of 2? 4? 10?
Again, I have my doubts about OBJ too, but I am sure before Jerry and Stephen psyche themselves up to open their wallets to a Free Agent like OBJ they will have their doctors check him out, and maybe work him out. I am also guess there won't give him a signing bonus this year so they can cut him if his knee is no good.