1) Whitaker
Whitaker is the only one on the list who makes it top 5 P4P all time. In his prime, he was the evolution of the Willie Pep way of fighting. He didn't get hit. He was the definition of a slick fighter. He had out of this world skills. I can't say much more. The guy is the BEST boxer of all time imo. Put him in the ring with anyone from any era at 140 and he beats them. Now he may not be the greatest, but he is the best in-ring technician of all time. Put Whitaker on a paint canvas and he's a Da Vinci piece. Number 1 without much thought to be honest.

2) Roy Jones
Now I'm not big on Roy. Pound for pound he's great. Pound for pound, my interpretation at least, is predicated mostly on quality of victory and skills imo. Not so much who the guy has beat so for that reason, RJ has to be 2 even though when talking about GREATEST fighters, which relies more on quality victories, I think he is last out of these 5. But he is one of the most gifted athletes ever to step in the ring and just made it look easy.

3) Nard
4) JCC

Didn't rank Mayweather just because it wouldn't be right to.