I wouldn't say Paulie, he was loyal to LCN but not to Tony. Remember when Tony put him out of his inner circle when Ralphie was making money and he went to Johnny Sack? Even Christopher lost his loyalty to Tony, showing the whole world how much he hated him vicariously through his movie. It has to Bobby who was most loyal, Tony was grooming to be his successor if the day ever came towards season 6 anyway
Agreed. When the Vito situation was exacerbated by Vito returning to Jersey -- and Tony considering letting him earn rather than killing him -- Silvio spelled it out to Tony that he had a mutiny brewing, and that Paulie never did kick up a full share to Tony in the first place.
Earlier in that season, with Tony in a coma, Paulie first sandbagged the amount of the Columbian score, then dragged his feet on kicking up his share to Carmela. Only when Tony finally came out of his coma, did Paulie come running with his share (and then grimaced about it while leaving the hospital).
