I'm liking the theory that
all of the Dead Three are somehow involved, with each of our three antagonists revealed so far representing one of them
I hasten to say that I have no more evidence than any of you that this is what is going on. The sneak preview I've been talking about didn't give me any insight into the ultimate baddie or what or who the Absolute actually is. Or how the mindflayers are tied into any of it. I don't think we're short of mysteries despite the antagonist reveals we've had so far!