Astros need Garner!
I think what you saw the 2nd half of this season was due to Garner and he needs to stay. The "bad result" was, IMHO, more due to the loss of Pettitte and Miller. The bullpen just wasn't "up to snuff" to support the team. Miceli is or should be gone--just doesn't have it! Granted, putting Miceli in at the end of the 6th game may have been poor but look at the choices available. Lidge can't go every night and certainly not for many innings. If Lidge had stayed and we would have won the 6th game, then we would have needed Lidge @ the Series and he would be "burned out". Besides, we needed some runs for Lidge to have won it and that was lacking! You can't win a game w/o runs!
Biggio & Bagwell are, frankly, "over the hill" although very appreciated for their past performances. They did very well this season.
I like Garner and his managerial attitude. I think he's good for the Astros.
Woulda, coulda, shoulda! It was a great season and let's rejoice in that. The "stars" just weren't quite in alignment.