So, as most of us are aware of the whisper from Il’gynoth: “the Light has made a bargain with the enemy of all”.
One would, at first think Turalyon or Lothraxion.
Think, however, about Anduin and the Jailer. As we know, wielding the Light by itself is not what makes a person good. The Jailer, however, was extremely interested when he saw the Light answering Anduin in the maw. As if he was a sign or something.
What if the Light’s bargain is precisely that? Obviously, once Anduin awakens, he will feel used and pissed off at the Light, and probably allign himself with the Void, a force which antaganozises both death and the light.
It’d make sense, no?