I have to go other way on Gravano. He killed way more people than Gotti, and was as paranoid as Casso. It would have been one killing after another with him as boss, followed by him doing what he did when arrested, turning informant.
I agree. Sammy was greedy and would have been killing guys left and right to take over their rackets. The Gambinos would have been better off if Castellano had whacked Gotti and disbanded the crew. The next boss would have likely been Tommy Gambino or Jimmy Failla.
