I think of Ajencis as Socrates+Plato+Aristotle for narrative efficiency. Have all of them in one guy so there's a few less names for the reader to have to remember.
One huge thing that could happen (I don't really think it will, but...) we find out that we have been conditioned to accept Ajencis' interpretation of desire/object (especially of the Outside) and that he was completely wrong. How the fuck would he know that shit anyways? Was he a sorcerer too? A pre-cishaurim? Did he daimos his way outside or summon demons to ask their opinions of the fragmented god?
I don't really have the vibe that anything special is coming our way about Ajencis, but I could see him being revealed as part of some kind of ur-dunyain set that was at work before Ishual was built. THOSE people will be the real darkness that came before.