GSP got his rematch because he obviously was teh #1 contender.
Just because I think Sanchez should fight Penn or Hughes first doesn't mean I agree with Serra getting a title shot, but he was at least in the UFC at some point I guess?
I think Sanchez should fight Penn or Hughes for his own good. He's not ready for GSP. You can all love him and say AWE HE'S UNDEFEATED AND GREAT, but no. His gNp isn't near Hughes, and his jiujitsu isn't near Penn's. He's going to have to prove he can take either of those guys before he gets to GSP, and for his own sake.
Here is more evidence why GSP got his shot (I'm not sure why somebody said that like GSP got an easy way to his rematch?)
Sanchez- last 3 fights, all unanimous decision (With the only contender-level fighter being Karo P)
GSP - since his loss to Hughes - Jason Miller DECISION , Frank Trigg SUBMISSION, Sean Sherk TKO, BJ Penn SPLIT DECISION. All 3 of those guys were the #1 contender at some point, two of which he actually finished.