Was already exposed by Molina, Malignaggi and Maidana, who are most definitely not A class. Paulie outboxed him and Maidana outfought him. Porter just rough housed him. That basically tells you, he is not good against any style up at Welterweight. His physical attributes are negated and since that is gone, he's got nothing to trouble the top guys and the guys a tier below.
Porter beat Broner more convincingly than Maidana in terms of rounds won. He's easily a top 5 WW right now. If that's not A grade, I don't know what is.