If you're ruling out Gotti solely because of Sammy the Bull, I would say to think again. How do you know for sure that he admitted to every murder but Rotondo's? There might have been more. Jimmy's own family does not know the actual truth, so I guess the world may never know. It's a shame, though. He was a great man.
Why would Gravano hold back on the Rotondo hit after he flipped? Why would he admit to 19 murders, including Castellano, but not admit to the Rotondo hit? Rotondo was a very powerful guy, so it's not likely that Gravano would not remember.
