If I remember correct Vito was Luciano underboss till he had to flee to Italy in the 40tys because of some murder. Costello's was consig and got bumped to acting boss or was he the official boss of the genovese family by 1950ish. My point was vito had all the power when he went on the run and when he came back to the USA he job was taken. I think the commission backed Costello's it wasn't really about any capos in there family. The power was the other bosses