Reading through all that reminds me of a thing I'd been thinking about these past few days—which of the three attempted sacrifices Venat argued against in the infamous post-Elpis scene, as well as whether the scene was intended to be symbolic or literal. But specifically this part:
I had already been musing over the idea, but I think this actually gives it some merit: The scene where Venat walks through the ruins of Amaurot, chews out the survivors for not being able to cope with their loss, then righteously sunders the world? That might actually be what Venat/Hydaelyn remembers happening. Whether that's because of Elidibus-style memory degradation or a Cid-style refusal to accept the truth, Venat may simply remember things happening in a way they truly did not.Mikoto: We must be careful of what we observe, however, for while the information stored in a person's memories can be quite comprehensive, it is not always true to fact. They can be distorted due to the passage of time, or even when first committed to the mind as a result of personal bias.
Mikoto: That is why it is important to mark the distinction between explicit and implicit memories.
Mikoto: Explicit memories are those consciously stored and recalled, while implicit memories are more passively accumulated by our subconscious.
Mikoto: When meeting someone for the first time, their appearance will be kept as part of our explicit memory, though this may fade with the passing of time. Should a great deal of time pass without meeting, however, such recollection can prove difficult.
But if that were the case, I imagine the story would have built on it instead of leaving it as a loose end. And I doubt they'll ever revisit it, given how hard they pushed 6.0 as the end of the Hydaelyn/Zodiark arc.