Hansbrough is 6'9.5'' I don't see how he's undersized as he's bigger than Diaw. He wasn't too small when he was ripping the wolfpack to pieces
Kevin Love has nearly identical length, more weight(strength?), and better shooting range. But he doesn't strike me as having Hansbrough's level of quickness. From what little I've seen, Tyler can D up perimeter bigs pretty decently.