I think it's farily obvious that Diego Sanchez is the best fighter to come out of The Ultimate Fighter. Certainly no one has been as impressive as him, with the possible exception of Josh Koscheck, who really only stalled after Drew Fickett hit him with that lucky knee. I had high hopes for Bisping, but his outing against Schaffer was lackluster. Chris Leban is an undisciplined lummox, Ed Herman pretty much the same, and Stephan Bonnar hit the needle and still lost to Forrest Griffin (himself not amazing).
That having been said, I think Diego Sanchez has some ground to cover before he starts in with the top welters in the UFC. He's got a couple of impressive wins on his record (Diaz and Parisyan), but he's got a lot of meatbags on his sheet, too. He hasn't been in a fight that required a real gutcheck. He comes off as arrogent when they let him talk - is his ego writing cheques his ass can't cash? What will Sanchez do when he gets into a real fight with someone who can reach down and pull it out when things get dodgey? What will Sanchez do when Hughes muscles him to the ground and pins him, when Penn (assuming he comes back to welter) bends in a way you wouldn't think humanly possible to lock in a submission, or when Rush shoots out a spinning back kick so fast Sanchez didn't see him turn?
I'd actually be more confident about Sanchez if he had a loss on his record. You can tell a lot about a fighter by how they come back from a loss. Will Sanchez have the will to reach down when it really counts?
It'll be interesting to find out.
"What's crazy about standin' toe-to-toe and saying 'I am'?"
- Rocky Balboa