I don't think anyone has said that he has been a locker room cancer or a poor teammate. Just very dominant and outspoken. The concern expressed by Silverstein seems to be about how he might react if suddenly he was #3 on the pay scale, with the team not interested in negotiating with him. If he became sullen and uncommunicative, it wouldn't necessarily make him a cancer, but it could have an increasingly negative impact among the OL as the season went on.