The same one that almost got Bayern a Treble last year and won the CL with Barca before. You can't have a perfect coach man. It's like in the Wishlist thread, every potential player is either overrated or incredibly overpriced or not young enough. You can't have them cheap, pretty and super awesome all the time.
Besides, if all in a coaches resume that counted was their last team, then no one would coach more than once.