I don't know why he should have to?I could understand if he was the undisputed heavyweight champ like Lennox Lewis was when Rahman beat him, of course he wanted a rematch because he had all the belts!And as far as McCall it was 3 years later that he finally went after him and that was because it was for the vacant WBC belt.Why would Wladimir at this point go after Sanders and Brewster , neither of them have a belt and that is his goal right now and that is what everyone wants isn't it?