Until someone comes along that has a better stand up game and can keep GSP from taking him down he won't lose. His wrestling and athleticism is too good for anyone to take him down and dominate. His BJJ defense is very solid. Other than Hughes subbing him I don't think I have ever even seen him in trouble regarding submissions. Maybe BJ in the first fight. Shields is a really big WW and may be the kind of fighter that can impose his will on him but if can't get the take down then GSP will turn his lights out inside of 3. Nick Diaz to me wouldn't beat George but I think his rangy build and stand up could make for a very interesting fight at the very least closer than any of the last few.