Look I don't wanna be a buzz kill here, but there is nothing that warrants Marquez (besides money) to be in a rematch with Floyd. Besides Pacquiao whom he fought 4 times he hasent fought a credible opponent he didn't already know since Katsidis 2010. Unlike Pacquiao, when Floyd fought Marquez and Knocked him down, Marquez didn't get back up and start to figure out Mayweather. it was Pretty Much Down hill from the opening bell. Besides Power, Timing & Beard, everything else about Marquez of old as oppose to the new is faded. Mayweather & Marquez are both counter punchers and if there fight showed anything it's that Floyd is better Offensively, Defensively and timing as opposed to Marquez all with a 2 year layoff. Check the stats!
First fight against Pacquiao he gets knocked down 3 times figures him out... Draw
2nd fight he gets knocked down 1 time figures him out even had Pacquiao hurt a few times... SD Pacquiao
3rd fight... Well he already had him figured in the 1st 2 fights, this time he avoids getting knocked down... MD Pacquiao
4th fight... Well he should have his pace down now over a 8 year span all it takes is power and timing... KO Marquez
Point is, a KO of a normally Offensive fighter who hadnt really changed pace in all 4 fights and arguably was solved in 3 of em, shouldn't be seen as the ultimate reason Marquez can do anything dramatic if he rematched Floyd. Thats like saying Auturo Gatti deserved a rematch. He was clearly beaten.