Jason Thompson is a quality BIG that can play either the 4 or 5 without a problem. Neither Hans or McBob truly can play the 5.
Lets be reasonable and admit the only reason either McBob or Hans will start is that the Pacers don't have anything better at PF. Where else can either be the starting PF except on the Pacers? The Pacers need a QUALITY up grade at PF, and Bird knows it.