Marvin had a great sun as middlweight champ, but i don't think he was a great skilled fighter... some what of a magarito type fighter - his chin allowed him to fight his fight and force the guy onto the back foot and break them down.

When he fought truly skilled fighter like Ray and duran, even though they were MUCH MUCH smaller than him, look at the trouble he had... i mean true great natural middleweight should not get beat by a normal sized Welter, no matter how skilled they are, let alone one who had been so inactive... and duran, best @ lightweight... almost beat marvin...

of course being such a "fan boy" i am going to pick Joe... early on it could be 50/50 if joe fought a bit silly... but even if that was the case, take the kessler fight, he knows how to adapt and fight right, he has always done it so i see no reason for him not to do it if this fictious fight happened...

marvin was pretty easy to work, two steps into every move, good fighters can see it coming and know what he was going, he didn't has a great array of punches either, it was just non stop pressure backed up by that rock solid chin of his.