gsp is probably going to outwrestle diaz and stay safe on the ground and take the decision. then diaz is going to talk about how gsp didn't even hurt him and nobody is going to leave the fight satisfied.
That's a safe prediction but I really don't see gsp being able to sit in his guard and play it safe. Diaz is going to be in his face all 25 mins forcing him to fight. Diaz by gogo (and passing the pee test this time)