Timeline
In February 2009, JMM fought at 135 against Juan Diaz.
By 2009, Floyd had already fought as high as 154 and consistently had fought at 147 for a number of years.
In September 2009, Floyd fought JMM at a contracted weight of ten pounds heavier than JMM's last fight, at 145, and Floyd came in at 147 (by the way, not just unprofessional, also the small welterweight idea is put to rest or he would have come in at 145 if that were the case, as contracted- why pay $200,000 to come in 2 pounds higher if you're better at a lesser weight?), 12 pounds heavier than JMM's last fight. JMM jumped two weight classes to face Floyd.
In 2010, JMM went back down to lightweight to face Juan Diaz and Kastidis. 135.
In July 2011, he moves up in weight to face Likar Ramos at 140.
In November 2011, he moves up in weight again to face Pacquiao at 144 and comes in only 2 pounds heavier than his last fight. Barelly any fluctuation in weight between fights and it's been 1 year since he last fought at lightweight.
Therefore, he only moved up 4 pounds to face Pacquiao from his previous fight and fought him at almost the same weight he was in his fight before against Ramos. He also had one year to get comfortable fighting at 142 and had done it successfully against Ramos too.
For Floyd, he moved up 10 pounds from his fight before, and then faced Floyd at a 12 pounds difference.
After facing Pacquiao and losing in 2011, he fought a Russian at 140 and then went up only 2 pounds again to face Pacquiao for a fight at 147.
Bottom line: in the times he faced Pacquiao he didn't move around much in weight. His weight stayed stable, around the same before and after. When he faced Floyd he had moved up 10 pounds from his last fight and jumped two weight classes. Take that for whatever it is worth.
And the eye test, Marquez physically was a much different fighter when he faced Floyd than when he faced Manny. There's a meme out there that shows an entirely different physical appearance from Marquez 2009 and 2012. It's actually quite remarkable.
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