Since this is an IF scenario, MHO would be that Duran; gets KO'd, or he either quits, or he gets permanently retired, if they fight in either of those weight categories stated above.

Let's see... Dela Hoya quits on the stool then later retires.

Hatton gets KO'd motionless, then is now at present, on the brink of retirement.

Barrera gets stopped fades, never able to get his glory back.

Erik, got stopped, destroyed, and dulled into retirement.

Cotto in full tactical retreat a good part the entire latter half of their fight just to avoid being brutally halted.

Last fight against Clottey easily a middleweight at fightnight, was so scared in the clash that he clammed up into a twelved-round safety mode fight. Phobia of being halted was so great it killed all his aggression. Pussified.

So as with Roberto Duran... he quit against SRLeonard due to, humiliation or a little tummy ache, or for whichever side of the story you deem credible, should likewise quit, KO'd, or messed up into retirement if he had faced the PacMan.

It's an if scenario... so, tongue in cheek!