I just watched penn v GSP for the third time and I'm not sure ig=f GSP jus outworked him or he was never in the match, but by the start of the second BJ looked vulnerable, the third he had nothing and the fourth GSP was able to set up a takedown 30 seconds in after 3 jabs. What happened to BJ??
Gsp was the bigger man, better trained, and he completely outworked and outclassed Bj Penn.
Simple as that.
There is no shame in losing to GSP.