You see, more than the four Families in NYC, the Luciano/Genovese crew, because of their underboss Vito Genovese himself (who was napolitani) were always heavily composed of many napolitani/calabrese members, aside from all the Sicilians that were also powers in the family.

And in turn, dating to the very days of Frankie Yale, Toddo Dell, and the others mentioned (and many I did not mention), they were 'compare' with their napolitani brethren in Chicago, Torrio, Capone, etc.

But I'm preaching to the choir here, lol. Because you know all that already TD.