User blog comment:Blaziken rjcf/My prediction for S13 and S14/@comment-10889355-20171104085047

Yeah, I'm 100% sure they'll build the Shedim lore on episodes 20 to 22 then will be released on the season finale.

About Jack, I'm confident he's not evil at all but if the writers keep giving us Jack/Cas parallels and make us think that's he's basically Cas 2.0, then I do believe that Jack will do something he thinks will be good for everyone but end up screwing everything up.

I think Jack will be the one to release the Shedim.