Responses
This is my theory as well.
Maybe when he was dying, he didn’t actually die but only passed out, and his physical body remained alive. During that time, they took his body, possessed it, and controlled him. His current memories are real but incomplete because, while he was being controlled, he had no power over his own body. So Davin could only watch from his subconscious as he became the Demon King.
In that sense, both memories are correct, but they come from different points of view.
His eyes and all.. I think someone is controlling him so possessed.. I guess.