If the only thing that can kill an angel is another angel....

Oh holy heck, I didn't think of that.

So maybe Lucifer and his angel cronies are still angles but not actually affiliated with Heaven (or Anna, cause she seems like a free agent -chaos, Anna/Trickster!), and they still have thier grace. they were just kicked out of heaven? Like being kicked out of a really nice resort? or club?

Angel!Dean for the goddamn win!