User blog comment:Darkchief119/Season 13 Finale/@comment-208.108.119.71-20180511140150

Death would certainly make sense. Billie did state that one of Dean's possible deaths is being burned by a red-headed witch, and there sits Rowena with the prophecy that Sam will kill her. Billie did say "See you soon, Dean,"  so that is a nice, tidy set up for the final episode.

However, IF Jensen is playing a character that is NOT Dean but retains his meat suit, I don't know if Death fits that description. Sounds more like possession.

When Billie became Death and took on Death's roles and responsibilities, she still retained her own personality. She didn't play Death as Julian Richings did. So then, if the writers follow that precedent, Dean as Death would still be Dean, just like Demon Dean was still Dean.

Of course, since Dean isn't a reaper, she would have to give him Death's ring so he could be Death. I wonder what her motivation would be to do that.

Could Death possess Dean?

However, if we consider that Jensen is playing a character that is NOT Dean or Dean's body but does LOOK like Dean, then that isn't possession. So maybe Death is walking around looking like Dean for some reason.

I thought maybe the Cosmic Entity was coming to Earth looking like Dean while Dean is dead or in the Big Empty or something. But obviously Jensen never played him before. I'm not as familiar with the canon as the rest of you. What characters, besides Demon Dean and the Shapeshifter and Leviathans disguised as Dean, did Jensen play?

Whatever I hypothesize, I figure I will be wrong. I can't predict what the writers will create.