The whole thing. Davis has been bad this year (I guess you will argue he's been unlucky, but he has to be one of the unluckiest pitchers in the game this season), and while Bush hasn't been great, he's been OK. In fact, he's been fine as a #4/5 type starter, which is all he should be on a team trying to make the playoffs. It's obvious he isn't the same since getting injured last year, but I wouldn't just flat out say he's "a bad pitcher."