I agree completely, GSP has never faced a well rounded guy until now. Not only is Diaz well rounded, he is unorthodox, it will be hard from GSP to anticipate his moves.
I'd love to see Mayhem corner him as well, haha.
BJ Penn isn't well rounded? He doesn't have the physical size or strength to beat GSP, but he's more well rounded than Diaz.
Diaz is overrated. He's a good fighter (not elite), because he hasn't fought very many good fighters outside of the UFC. Diaz does well with strikers, but I think he still has a hole in his game (wrestling) which is a bad hole to have against GSP.
I'm really not that interested in this fight, which probably puts me in the minority. I think Diaz would lose to Fitch, Koscheck, Penn, etc.
I think Diaz is on the 2nd tier of WW's with Condit, Alves, Sanchez, etc.