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As a Napolitani he was allied as a kid and young adult with Brooklyn's Camorra (think Frankie Yale, Toddo Del duca, Little Augie Pisano). That's why when he relocated to Chicago he was in the employ of Big Jim Colisimo (another non-Sicilian). But at some point as Turnbull says he allied with Joe (The Boss) Masseria in NYC to help him fight the Aiellos in Chicago, who were Sicilians and allied with Maranzano.
To help in this effort and to better control the Windy City, thats why Masseria DID induct Capone into the ranks of the Mafia, thereafter elevating him to the rank of Caporegime over the City of Chicago. Capone in turn inducted the likes of Tony Accardo and others as soldiers.
Otherwise there would not have been a formal Cosa Nostra structure there, nor wood Chicago (Capone) have been included on The Commission or in its meetings.
Laurence Bergreen, one of the better Capone biographers, writes that Frankie Yale was Big Jim Colosimo's assassin. He says he did it to expand his reach into Chicago by knocking off old, fat, lovelorn Big Jim, and displace Torrio, a former ally. It backfired: Big Jim's murder cemented Torrio's hold on the organization.
Although Yale was indicted for the murder (charge dismissed when witness "forgotti"), I find this story hard to believe.
