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 know in
the Booknotes interview Peter Maas said he gave Sammy the benefit of the doubt because he didn't flip after the first murder case.
For whatever that's worth.
