If that happens, he would be 10-15 for me. Same level as Sugar Ray Leonard. I can't see Manny beating Shane though, JMHO.
He wouldn't be top 10 or top 15. Those are extremely hard to crack because older fighters are put up on too high of a pedestal.
He'd be be somewhere between 8-12 in my opinion. if he were to then unify Welter by beating the Cotto-Clottey winner and win a belt up at 154 he's top 3.
that's cetainly debatable. tought task but if he does it, top 10 would be a definite possibility. if he beats the winner of cotto-clottey too, it will be a no-brainer
10 - 15 years from now when we've had time to properly reflect on his accomplishments we'll be saying that he's top a 10 ATG - regardless of how he does against PBF or Mosley.