Well, together with a couple of others, he was part of the group that functioned as Maranzano´s gunners/bodyguards during the Castellammarese war. Strictly hierarchically speaking, an underboss of any Family, would not be given such a task. So Bonanno was not the underboss or number 2 at that point. The murders the Masseria side suffered were most certainly importanat in terms of the outcome of the war. No one can argue successfully that the losses Masseria suffered were insignificant.