Why didn't Costello have Vito whacked earlier if their was extreme tension between the two? Costello knew Genovese was power-hungry and should have sensed a violent move sooner or later. Was it out of respect for Luciano? Luciano was still technically the Official Boss before he got deported; or was Costello afraid to make a direct move? Costello still had Willie Moretti who had a crew of killers in New Jersey; Anthony Carfano; Trigger Mike Coppola; and several other 'white collar'' capo's around. Man-power shouldn't have been a issue and plus; He's a Acting commission member I believe at that point.

I believe with Costello not making a move on Genovese before Willie Moretti was killed; Nearly costed him his life.