@TitoFan made it clear. Been so long since he was a LW, we just remember him going the distance with DLH, Wright, Forrest & co.
Before his 1st loss he was 37-0 with about 33/34 kos. Eve looking at his last 10 fights 4-5-1...he still retired with a 67% KO ratio. He was nasty at LW, but he chased the Golden Egg pass LW aka DLH, then found himself fighting guys way beyond his best weight.
The beating he put on Margarito IMO was proof that had he been able to maintain 140? he would've KO'd most with what he dished out to Rito. But then again Rito stood up to Pac rearranging his bone structure free of plaster!