Just look at his performances after. Sure, the first Koscheck fight was uneventful but he man-handled a stud wrestler at his own game.
Then:
Vs Hughes 3
Vs Serra 2
Vs Fitch
Vs Penn 2
Post-Serra GSP was the most vicious fighter we'd ever seen. It was only after his win over Alves, also very impressive, that he began to decline. That's because he suffered a groin injury that put him out for a while, then many injuries started to catch up to him.
Then:
Vs Hughes 3
Vs Serra 2
Vs Fitch
Vs Penn 2
Post-Serra GSP was the most vicious fighter we'd ever seen. It was only after his win over Alves, also very impressive, that he began to decline. That's because he suffered a groin injury that put him out for a while, then many injuries started to catch up to him.