Man that's a really difficult list right there, so many weight classes, so many eras, great fighters in all of them, my list usually consists of guys who are generally considered the GOAT at their true weight(s).
1. Sugar ray Robinson - from welter to middle, nobody better
2. Muhammad Ali - greatest heavyweight ever
3. Archie Moore - arguably the greatest light-heavy, 181 wins and the most ko's ever
4. Roberto Duran - greatest lightweight of all time
5. Henry Armstrong - Fought at featherweight, lightweight and welterweight and is the only fighter I can think of who is top 5 all time in all those weights
I know, I know, I've got Duran over Hank and Duran is probably the Latino version of Armstrong but Duran's level of competition faced was consistently higher imho, even though Hank fought Robinson and other notables. Duran went to welter and fought everybody in arguably the greatest welterweight-superwelter era of all times. But they are so similar in style, they both have over 100 fights won, both won titles at multiple weights, but like I said, Duran's overall comp was better imo. He started at a lower weight and won the middleweight crown as well, something Hank tried but never managed to do. But I wouldn't be mad at anyone putting Hank even as high as number 2.
