Has to be Welter in my opinion. Although the second Mosley fight and I believe the Vargas fight were both at JMW, I still think Welterweight was his showcase division.
Oscar weighed 130 for about three total minutes of his life; good correction.
His lightweight record is unreal, but he fought the real competition at welterweight, with one-seided victories over great fighters like Whitaker, Chavez, Camacho, Rivera, Carr and the like, as well as close fights with Quartey, Tito, and Shane.
His lightweight comp, Hernandez, Ruelas, Molina, is nowhere near that class
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