From what I read;
John Gambino took care of the Cherry Hill operations and was the top guy in NY; He ran the crew...Rosario was the top guy in the Philly/NJ area and took charge of local matters. John was rarely in the Philly/NJ area. He lived in New York.
Another thing; Some of the guys reported to Castellano; and some of the guys to their bosses in Sicily. Guess there was an arrangement??
It's so interesting that these guys had one foot in the NY Gambino crime family; and to their Sicilian Gambino clan in Palermo/Sicily.