Marquez shouldn't go above 140 It would be reckless and he would lose. He gives up everything by doing that at his age. If Floyd wants the fight then work down to 140, or else don't take the fight.
I disagree with the arguments that Mayweather is smaller than Hatton. He might have been so several years ago, but not now and not for a good while. If that was the case then why not take the Hatton fight at 140? Floyd has grown into the weight and fought there for about 4 years. Hatton has popped up there fleetingly and decided the best way to train for the weight was to eat some sausages. I have no doubts that Floyd is the bigger man there.
Mayweather should bugger off and make a fight with Cotto or Mosley, stop with cherry picking and fighting smaller men. It bores me TBH and his style is hardly endearing these days anyway.
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