Respectfully, you've made an elementary error.

In the 1980's there were same day weigh-ins. It's likely Floyd would NEVER have fought below 140 and would have been a welter/154 for most of his career. Or looking at it the other way with day before weigh-ins? Leonard et all might well be lightweights today.

Given THAT?

He loses to Hearns, Leonard, Duran, McCallum, Sweet Pea, The Hawk, Curry and he beats everyone else.

But let's be clear. Going say 45-6 against the 1980's welters is an enormously impressive thing!