He wouldn't dream of pushing for answers, not from Izunia. Getting him to stop calling him 'sir', however, might take a lot more doing.

"Oh! So you're aware of a lot of what happened with Prince Noctis?" He sounds so excited about that. And, in fact, if he had trouble placing the voice before hearing the way he says Noctis' name, that bright hopeful excitement, might be a bit more familiar.

"That really is fascinating. You must have learned so much over the centuries like that, then." The gaps in documentation you could fill, Izunia.