What are you talking about? Sherk was a WW fighter when he fought GSP, he dropped down to LW later.
BJ Penn was fighting at WW and even MW before resigning with the UFC and fighting GSP at UFC 58 for the #1 WW contender.
The second time Penn was the LW champion and challenged GSP because he wanted 2 belts.
GSP has never beat up on a 155er that wasn't fighting at WW at the time, or wanted the fight.
Slight difference from this situation.
Not really... GSP still took that fight with BJ. Even though that fight was at 170... BJ never even made it their. He weighed in at 167lbs or something low like that. So GSP had a Huge advantage over LIL Penn.
And whats real funny he still greased himself up in the fight in between rounds... More Grease then any fighter has ever applied in the history of UFC greasing....