No, the only way manny stands a chance at welter is that his exceptional speed. But how long can he mantain that? I see him having a good fight against some top welters tho.. cotto, mayweather and even mosley.. Basing on what he showed last saturday.
People are over rating Manny's accomplishment. He beat a weight drained faded De La Hoya. The same way he beat a nobody at 135 in D. Diaz. Oscar is smart in that he knows he would have a terrible time beating anybody in the upper echelon from 135 on up.