What's always going to hurt Floyd the most in these H2H match ups is that we never got to see him fight against someone just as overall good as himself. So these bouts come down to potential based off of him beating B/B+ level guys in his career.
For example, It's easy to say SRL beats guys like Trinidad, Oscar, and Quartey (2nd tier great welters) because he's already been in against guys like Hearns, Benitez, Duran etc.. that are better.
With Floyd for example, we're looking at his fights against guys like Judah and Hatton, and wonder if he'd be able to beat much higher classes of boxers in SRL, Hearns, Duran, etc..
That's a big ass step up, even for a guy as skilled as Floyd. In addition to that, he's not as physically strong or as imposing as those older generation of boxers.
Dude boxed cautious as hell against Canelo who is naturally bigger and while being a good fighter, is nowhere near being great.. Killers like SRL, Duran, Hearns wouldn't let Mayweather get away with boxing like that.
I know some in here will disagree with this post, and that's cool, but at least try to understand where some of us are coming from when we say shyt like Floyd loses to Hearns, SRL, Duran, etc..