Even at the fight with Casamayor, Marquez still had some bulk so it's not only now because he moved up in weight. Look at these two photos:
Casamayor Weigh-In:

Mayweather Weigh-In:

Not a really big difference.
Casamayor Weigh-In:

Mayweather Weigh-In:

Not a really big difference.
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