Al Capone would have been a "headache" for NY. What do u do with a headache? You try to get rid of it. He would've been clipped. Best to send him out to Chicago where he can make money for NY & be outta their hair. Plus he was Napolitano and back then the old timers were made up of all Sicilian bosses. The Sicilians beat out the Camorra Navy Street crew n took over all their territory.
Luciano/Genovese crew was the exception who were made up of Sicilians, Calabrians, Napolitanos, and Jews...or anyone who could make them money.