Sure, Lupo would pull a Gigante better then the Chin himself
Uncle Pat, and Bebby are two I can think of. Bebby was in on trying to kill Tony in the first season. He was later transferred to Tony's old crew. If someone in the family wanted to make a move on Tony, it would be him, as old as he is, he still had respect in the family for only being a soldier. Larry is the natural choice for being boss IMO. Uncle Pat would make a good Consiglieri.