I'm on the fence between what K train is saying and what others are saying. There's no denying when Ben is healthy and puts the ball where it needs to be that Wallace has been a beast. He was the first half of the year.
I would also say that I have seen, and granted it's only what we can see on TV when the game is on or during interviews, the he can tend let it get to him too much when he doesn't get the passes he normally gets. He's one of those receivers where you need to get him involved early into the game. Just going to him now and then renders him somewhat less effective.
I've said it a hundred times already too, it's an adjustment year for him being the #1 guy now when he's used to being #2 or #3 the last couple of years. He'll grow into his role and excel but Ben has to stay healthy. Wallace needs to also learn how to break free of double coverage and not just always run by people. Like I said it's a process.