It's not really that your rates are unrealistic, it's that it is a pointless endeavor. The Cubs are a very flawed team with very flawed players, one of which is Carlos Marmol, who regularly implodes and gives away a win with walks. The bullpen in general is filled with has beens and nobodies, along with a relatively decent arm or two. Hey, imagine if LaHair wasn't hitting like a god amongst men right now. The Cubs would probably have lost more games. Isn't it reasonable to expect Bryan LaHair not to OPS 1500 or whatever the hell it is right now?