HAHAHAHA. GSP as a Light heavyweight!
Could you imagine the gut he would have by gaining 40 pounds. Of course Chuck would beat him because GSP would be out of shape. No way shape or form is GSP moving up.
Also, Chuck has plenty to prove. The man is a fighter. New talent is coming to the UFC everyday and just because Chuck has beaten all of the big names (save Rampage Jackson) doesn't mean there is no one left. The new talent may surprise you.