Mayweather- for blantalty ducking pac on hollow accusations. or Pacqiuao- for refusing to submit to floyds testing demands.
none. Legacies are affected by what happens inside the ring not outside. they both lost the potential to improve their legacies, Mayweather more, but no fighter's legacy takes a negative hit from failed negotiations. Not in my book.
Both, however, if each retired before talk of this fight, with Pac there would be no question marks over his career after beating Cotto. With Mayweather, you can't say the same.