At so many different weight classes? Stops undefeated, top dog Nunn at MW. Beats probably the best CW of those years in Jirov at CW. Beats Peter (One of the top heavyweights in the world at the time) the first time around in many peoples eyes. Impressive stuff in my opinion.
Pacquiao should be obvious here Sasakul at 112 Ledwaba at 122 Barrera at 126 Marquez at 130 Hatton at 140
I don't know if I can effectively answer Russell's question, but I think James Toney would have been a very difficult fighter for a lot of great men to beat. Hell, he's 40 years old and fighting well beyond some of his best weights, yet guys still can't seem to get a decisive win over him. In the prime of his life, Toney sometimes fought as many as 5-6 times per year, taking on quality opponents. He somehow made it through 82 pro fights and several weight divisions without ever being stopped by anyone.
Surprised no one mentioned Arguello, especially given all the focus on him lately. He was the first one that came to my mind. Beat Olivares at feather. Beat Escalera at jr. lightweight Beat Watt at lightweight, then Ganigan for good measure. Challenged Pryor at 140. Also, Armstrong: Beat Arizmendi, Belloise, and Sarron to unify at feather. Beat Ross at welter. Beat Ambers at lightweight. Also challenged Garcia at 160, who was not officially "the man," but was speculated by many to be the better of the two title claimants. And let's not forget Fitzsimmons: Dempsey at middle. Corbett at heavy (also Maher, the title clamaint). Gardner at light-heavy.
Nar i know mate, i don't actually mind Floyd, i just think Pacquiao is probably the nicest guy in boxing.
James Toney could have added Julian Jackson and Nigel Benn to his list of victims too. Not his fault they were scared of him, haha he always called them out. I remember after the barkley fight he was like "terry norris, nigel benn, michael nunn bring yo ass"