He's been talking about this fight for years now, and now hes done. He pretty much got dominated for the 5 rounds in terms of the "criteria". He knows, he cant beat GSP and he knows he can't beat the strong wrestler style. It seems befitting for him to go out, after this, because this is what he wanted. It was kinda sad, but I think he meant it form his heart, and he knows deep inside he cant win against these wrestlers.