User blog comment:Tommy,Klaus&Kol2012+/One character that probably wont return(spoilers ahead)/@comment-10889355-20190708050554

Mark is never coming back, and Crowley's story is over. That's that. To be honest, I don't want him to come back. They ended his story in a decent way and I'm okay with that. I'd rather have that than have the writers bring him back and give him some garbage storyline that wouldn't last for a couple of episodes.

As for Rowena, she already grieved. She already accepted the fact that her son is gone and will never come back. Her conversation with Death at the end of Funeralia says it all.