you'd have to find a guy small enough to make the low weights to beat greats, and good enough to beat decent WW later in life.
if you take away everything from below 130 i think floyd mayweather could do it. if you took away evertying below 135 duran could do it.
duran was actually very small when he turned pro as a teen. i haven't seen enough of him to make me think he could beat top 122-130 lbers, at that stage, though. he was just a boy. a boy who fought pro at 120-122 lbs and knocked a bunch of panamanians the f#ck out
if they didn't ahve to make the weights i could name a gazillion fighters. gatekeeper HW from the 90's would suffice. just pick bigger guys. tommy hearns would knock juan manuel marquez into next week.