BJ looked great, I'm sure the 3rd round is extremely dissapointing for him, but for 2 rounds he put the #2 WW in the world in some seriously dangerous situations and took the fight to him.
BJ has nothing to prove imo, he's a 155'er that's top 5 (at least) in both LW and WW divisions. No other fighter can say that. When Liddell, Hughes, Ortiz Couture were on the top of the world in MMA, so was Penn. Difference is Penn is still here and testing himself as much as he possibly can.
Whether he fights tomorrow, or we never see him in the octagon again, he'll forever be my favourite fighter.