User blog comment:Blaziken rjcf/My prediction for Alpha and Omega/@comment-87.116.253.143-20160527163737/@comment-34326521-20160527193029

I think Billie is the new Death. She was reading one of Neil Gaiman's comics featuring Death, one of the seven Endless. When an Endless dies, another being takes his/her/its place, with all the memories and powers of the former, but a different "perspective", as they call it. I think the writers were trying to imply that's how it works in the Supernatural universe as well.