When Season 14 picked up, Michael in Dean’s body was off hunting and killing people, demons, and angels who disappointed, and the good guys had no choice but to cope with life without him.
The Season 13 finale saw Dean taken over by Michael, and Michael declined to return control to Dean after they successfully killed Lucifer.
Supernatural returned for its whopping fourteenth season on the air, and it wasn’t just business as usual with the Winchester boys saving people and hunting things.