Basically the ideal time travel au past! Jon / Elias is whatever would make future Jon bang their head into the wall the most. And it’d be so funny and so sad if them trying to prevent the apocalypse caused their past self to run straight towards it. Congratulations you have become what you sought to destroy ! Again
Jon: Elias knows more about the supernatural than any man I’ve met. He’ll know something about this.
Future Jon, who’s still grieving his relationship with Jonah, who never got to properly process the fact the man he looked up to and respected turned him into a monster, who still sees his corpse when he closes his eyes, who had to kill the only man left who ever truly understood him: ARE YOU FUCKING STUPID