User blog comment:Rafe Adler/"Funeralia" Discussion/@comment-31057575-20180420090609/@comment-3169324-20180420171957

And how, pray tell, do they set Michael free? He's locked in the Cage, buried deep in Hell. The only key that doesn't require a spell from a very powerful witch involves the four rings of the Horsemen.

Naomi didn't "heal" Castiel; she brainwashed him, and only because she could overpower him. 11 angels can't overpower an archangel.