Has it been mentioned yet that The Absolute is the woman who has been narrating our actions throughout the game? It'd be silly, but very meta if she turned out to be a DM. x)
Again, the intro refers to the absolute as a group. "Absolute unity."
If they have a leader it's only to lead the flock itself. But the absolute is more of an idea. A leader you can just kill. But an idea? Much more difficult. That's why the absolute has as much power it does.
As for the absolute itself, someone could be pulling the strings. But they might not be part of the absolute itself. I suspect that's where this is going. Especially since it's already been hinted that the netherese are behind it when trying to find a cure.