Who has any theories about who will be the last boss in all game?

I completed fraud and now I have a theory about the last boss in game. I think we’re gonna get a fight with god or hell because nothing in game (except for a new enemies in fraud) has eyes and eyes have only a hell. Maybe we’re gonna have a dlc about heaven where we gonna kill everyone in heaven. Also my theory is if we’re gonna fight the hell, we’re going to fight with its heart or idk. Now I don’t have any theory, if someone has any theories I’d like to hear them.