Give Koscheck some time to develop guys. He's just started out. ON TUF he had little training besides his superior wrestling background.
All Hughes was in the beginning was a wrestler also,but he developed into a much better MMA Fighter. Koscheck is 2 times the wrestler Hughes was,although time will tell if Koscheck develops more skills.
It would horrible to see Diego and Koscheck fight atm. Diego would likely kill him and Koscheck would have to try to use his superior wrestling skills to just keep Diego from hammering him. IF Koscheck survived to the judges it would just be a very boring fight.