I don't hate either Klein or Girardi, I just think they are vastly overrated and overpaid players.
Kostka has made some egregious mistakes, but it is not like Girardi doesn't do that as well.
The fact is that Kostka has been a vastly superior possession player (albeit in a limited sample) over the past two seasons compared to both Girardi and Klein.
Girardi's possession game has been in sharp decline, so I'd like to give him some easier assignments to see if he can be a good contributor there. I've looked into his numbers before and it showed that he is very good against easy competition, but struggles mightily against tough competition (so his current usage is baffling).