The top positions within the Masseria Family in and around the time of the Castellammarese war is actually crystal clear. Gentile mentioned Pollaccia as Masseria´s consigliere so there is no doubt about Pollaccia´s position. I have the passage right in front of me. Other sources, Gentile, Valachi and Bonanno included, mentioned Pepe Morello as Masseria´s underboss.

Toddo, close to all info (if not all) you can find on the NY Mafia in and around the time of the Castellammarese war is derived from Gentile, Valachi and Bonanno. Those are the "mothers of all sources" and serve as basis for all (accurate) articles and books you may find on the subject. (NY Mafia Castellammarese war.)