Sherk or GSP. Both if they LNP. But GSP has the best chance since he has the size advantage. BJ has sick TD defense. As long as Anderson and Nog stay in the UFC, that's a big NO for Tim and Rich.
Rampage already proved he's better then Chuck, he's stopped him TWICE!!!
A third fight would be just a meaningful as a third Chuck/Tito fight. Rampage ran through Chuck like Chuck ran through Tito. Neither have anything to prove!!!! Chuck does not look better the ever IMO. He couldn't even KO Jardine or Wandy who stood in front of him and took his best shots. Wandy was KO'd in his last two fights, but Chuck couldn't get the job done! And Rampage only gets stopped by knees from Muay Thai experts, and Chuck don't even throw knees!!!
But IMO I have none of them winning there titles back. I'm convinced each person who beat them is levels ahead of them and beat them for a reason because they are better...besides Serra who is just GSP's kryptonite!!!