I don't see how he's peaked when he's got so much to learn.
I feel he has pretty much peaked statistically. That doesnt mean he has peaked as a player. Duncan basically peaked statistically as a rookie, only a complete idiot would argue he isnt a vastly better player now. Yao will put up the same kind of numbers, those things you said are the little things he will add to his game that will make him a better player, just not statistically. Yao should get a bit better yet.