User blog comment:SeraphLucifer/Discussion/@comment-79.115.69.72-20160126210828/@comment-9249716-20160127045528

Also, the writers themselves ahd to play off of real-world lore (especially since they're using the Judeo-Christian creation story for the backstory of their fictinal universe) to establish certain aspects of the fictional universe they made. As I said, if they had gone with the explanation I used in earlier years, it would've been more consistent. But since seasons 1-5 were actually planned, with season 6-11 not being fully planned out, they're working with what they can to TRY and make it consistent. It's far from perfect, and what they have up to this point would've needed SERIOUS work and revision, but given everyhting I've said, it's really not that much of a stretch, at least compared to them throwing out the darkness storyline.