Why? If he can still get word out to anyone why install someone else to be boss to only be taken down? Shit, him and Allie Boy both can still run the family from prison and what can the Feds do? Absolutely nothing because both are in for life anyways. Why make another son, etc. a lightning bolt?

Unless the Feds take away their privileges like Frankie Breeze got in Chicago when they wouldn't let him make or take any calls or even see anyone then they would be crazy to risk a family member being locked up by naming them boss.