Joe. What is the chance of Sammy only killing one person, He became one of John Gotti's best right hand man and before he met Gotti he worked for some crazy people in the Colombo family. All his years in Organized Crime, you think he killed one person? Haha.
You don't have to kill personally in order to become a made member. You just have to be a part of the hit, whether that be shooting the guy, cleaning up, or driving the getaway car. It's said that Gotti never pulled the trigger, so I don't find it unlikely that a guy like Gravano pulled the trigger only once.
