Do you mean according to the mob's own rules, or that dynasties would just never bother with the mob? I'd have to question the former. I would bet Costello must have had friends in those Rockefeller-type circles. How else would he have obtained the control he did over the courts and political halls? Kind of a small example but Francesco Lanza in San Francisco built Fisherman's Wharf with Giuseppe Aliato, whose son Joe would become mayor, and Lanza was recognized by the Commission as the first real boss out there.