Sugar Ray Leonard would KNOCK OUT Mayweather in 9 rounds

[imp]

Dunno about Money getting KOed by Sugar. Certainly possible though. I would sway more toward a Mayweather UD but still...

Leonard is certainly credible opponent for Money.

I would say Mayweather may have been, a credible opponent for SRL as compered to WHO was
about in the 80's, far higher caliber fighters back then to what Floyd has faced.
Far to many great fighters in that era, Floyd would have lost quite a few back then, he would have been
sparked a few times.
I think Floyd would have hidden down at Super feather or lightweight, in that era there again there
were fine fighters at them weights as well.

Where would calzaghe have been in past eras?

Wouldnt have had as many injuries in those days to lie about and would have to travel.

Bottom line is that we can all make up some reason why an undefeated fighter wouldnt survive in a certain era as its all fantasy..