When you listen to the tapes Gotti is clearly trying to push the blame onto Sammy but being the moron that he was he also implicated himself. For example when talking about Robert DiBernardo he said “When DiB got whacked they told me a story I knew why it was being done but I whacked him”. So on one hand he is trying to say that Sammy/Angelo were the ones pushing for DiBernardo being whacked but he still says that he whacked him. Then Louis Dibono “You know why he’s dying he’s dying because he refused to see me when I told him to”. Look Sammy was a cold blooded guy no doubt but from his perspective I can understand why he felt a Gotti was either trying to screw him or kill him later. He even refused to sammy talk to the lawyers alone about the case