I am with you here. He does actually punish his opponents in the ring. It may not always look like he demolished their face but when he continues to dominate them in every aspect of the fight it takes it toll on ppl mentally, and that is how he "demolishes" them. Just look at everyone that has been a contender for the belt, and look at what they have done since they have lost to GSP.
He's a world class true mixed martial artist.
