Now that I think about it, it isn't unlikely that Roy DeMeo would flip and the feds would take him in. Castellano had to be their number one target and DeMeo dealt directly with him. I know they had Castellano on tape but they also had Gotti on tape talking about murders and they still took Gravano in. Plus I'm sure he'd have info on plenty of other mobsters. I know he killed heaps of people but he could just lie about the body count and/or motives behind the killings just like Gravano.