Gram lets not loose track that Phil Leonetti also tore down Cosa Nostra by virtue of his cooperation. Also, he ratted only after he was sentenced, not before leading to have us wonder what his true intentions were. Personally, IMO it was because he just couldn't do that large amount of time. He could blame his Uncle all he wants but he loved the power when they were on top. Nicky was crazy but make no mistake about it, he was a stone cold gangster and true Cosa Nostra.