The concern with running the offense through Wagner on the block would be that he hasn't really proven he can pass out of the post. He has a few nice ISO passes this year from the top of the key, something they've been working on, but I'm not sure he has an assist out of the post. Part of that is that he isn't usually doubled, but the other part might be that he just isn't comfortable seeing the floor down there.
The other issue is that he's one of the best roll men in the Big Ten if not the country because he can finish at the basket and is a pick-and-pop threat. So that part of the offense is important as well.
I'm all for getting Wagner as many touches as possible, but I think there's merit in getting him touches in different areas (pnr, low post, face up from the wing) to utilize his versatility.