Tommy Gambino whilst a nice guy and no doubt an ace high businessman was never cut out to run a crime family.
Bilotti had the balls but not much in the brains department.
He was however liked by Paul and so would have figured in some senior role (underboss).
Frank DeCicco would have been the sensible choice for street boss.
Now all they would need to do is keep Gotti's giant ego on the ground and things should run smoothly........