User blog comment:Thetwindler/Dropped/Discarded Ideas throughout the seasons/@comment-2605:A000:122A:408A:91E8:8778:19BB:9B0B-20191214224113

I wondered if Eve had a larger arc planned and then got cut short.

Dean seemed to be using drugs for one season (6 maybe?).

The Staff of Moses was broken up and its pieces sold. Did they find all of the pieces?

Billie's "cosmic consequences" for breaking their deal.

Dark!Kaia probably wants her staff back, although that may be showing up in 2020.

And, so far, the deal with Heaven running out of angels/angel power. Michael may take care of that now.

Also, Jack ushering in an earth-version of paradise. Although this may still be reckoned with this season as well as the resolution of Castiel's agreement with the Entity.