I think when ppl talk about p4p they place an emphasis on skill set rather than their weight. If all thing being equal and all fighters such as penn, fedor, silva, gsp, even lesnar where the same weight how would you rank them?
Lesnar simply despite his great wrestling skills relies on his disproportionate size advantage and if all things were equal he wouldnt make the top 4.
Anderson Silva? Great fighter but lets face it he again relies on a size advantage despite his great striking and takedown defence....if his skills where tested at LHW would he be as effective? Simply put we cant know for sure so that lowers his rating imho.
GSP again great skills best in his weightclass, but again relies on a size differential.
Fedor, is a legend fights guys that are bigger than him could prob cut to LHW if he wanted, however the only thing that would prevent me from putting him numero uno is the fact that the HW division across mma is too dispersed.
Bj penn fights at his natural weight, his take down defence grappling stand up is superior to everyone in his weight class. Even guys like sanchez (who after weighing in at 155 got up to 167 in a couple of hours)
So i'd put it
Sonnen On the spider
“If he wants to leave the division, leave the sport, who cares, Beat it, nobody tunes in to watch him anyways, and his little fake ‘I don’t speak English.