I'm beginnin' to think this is some kinda paradox, what with all kindsa people showin' up from different times and places for a theoretical war between good and evil. Though I can't figure out which one because the Grandfather clause applies to the ones that came from the future, preventin' somethin' bad to save their world but then there's the predestination paradox where those of us from the past were meant to share some kinda knowledge to help out.
Maybe.
As much as I like a challenge, I feel a little over my head about this one. Supernaural forces and physics go together a little like oil and water sometimes.