As an aside, it is pretty weird in hindsight that Elidibus had such glaring memory issues when Venat, sitting in the heart of the aetherial sea, did not. But it's also pretty weird that Endwalker introduced Kairos, a fantastic device that can irresistibly erase and rewrite memories, and then just sort of discarded it after the Elpis climax.

Not gonna lie—I'm not terribly enthused at the idea of Kairos coming up as an explanation for that, though. I can only imagine one character having any reason to use it on him, and it would just feed into this even more.