If De La Hoya fights Cotto next year that it's going to be at welterweight? Who said that he was going to fight at 147? I'm sure that if this fight happens, Oscar will make sure it will be at 154.
Maybe he will lobby for a fight at 150 or 152 lbs. But I still think if the money is right Cotto and Arum will agree for 154 lbs.