10-15...you got yor usual batch of ol'timers in there that'll never budge, mix in the modern greats like SRL, Duran etc....Than you got pac within that mix as the only contemporary great.
you're a dumb son of a ***** if you think Pacquiao is in the top 10. even top 15 is pushing it. I have him around 25-30
50 years from now, with some distance & the perspective that goes with it, how many people do you honestly think are going to look back and say "Oh yeah. That Manny Pacquiao, he was one of the ten or fifteen best to ever do it, in any weight class, ever..." If you think a lot, then you are really just too caught up in the moment.
Or inversely, 50 years from now you can be telling your grandkids that you were there when a former streetkid selling cigarettes sticks from the Philippine Islands tore through flyweight to middleweight to become one of Boxing's greatest. A legend only grows through time. This isn't meant to be hyperbole, ol' timers in 2060 won't be reminiscing about Ali, I tell you that much.