It seems so convenient for people to say guys like Marquez and Pacquiao shouldn't be fighting at 147, yet it was expected of Mayweather to move up at least that high. Marquez started his career like 4 pounds lighter than Mayweather when he was 20. Its not Mayweather's fault his skill allowed him to climb weight classes so effortlessly. I don't think MAyweather is that much naturally larger than PAcquiao or Marquez.

Marquez is more fighting a 140 pounder because Mayweather weighs in on fightnight as a large lightweight or an average 140 pounder.