His name doesn't deserve to be in P4P discussions anymore. I get that this forum loves Penn but he's simply lost too many fights to be relevant in any P4P discussions.
Anderson Silva never moved up and beat the best LWH in the world, GSP hasn't moved up and beat the best MW in the world. BJ did that shit.
He is considered the LW GOAT, has fought the two greatest WW's of all time and has a combined record of 2-3 against them and many would argue he should be 3-2 against them. That is epic, when GSP does better than 2-3 against Anderson Silva and Dan Henderson or Anderson Silva goes 2-3 or better against Chuck Liddell and Jon Jones than we can clear BJ from the list but that hasn't happened.