Mancuso would not make so many, he might add ten, but he will not jeopardize his Lucchese and Genovese backers. Keep in mind that the Sicilians might be at each others throats from time fo time, but the zips in both the Bonanno and Gambino crime families have a actually grown strong since both Gotti and Massino were removed from the scene. Mancuso just shelved Joe C, Vito and Joseph Grimaldi, and Porky, all guys the zips in the family highly respect due to how they did their defense but it really was so he had no threat to his position. He made JP his underboss for all things, no way he is going to buck those families after what he did.
The Colombos are still written off as a joke. They still have some heavy hitters. Bring that hight in the family membership, would be seeing guys disappearing or those bodies being found later on.