Why doesnt Zodiark have an Entry in the Codex when Hydaelyn does?

[KizuyaKatogami]

It only updates when they're mentioned in the story from the point at which you get the codex onward. Hydaelyn has been mentioned, Zodiark has not. Although Zodiark is mentioned in "The Reflections" it seems like it follows this strict rule about it needing to be part of a new main story cutscene.

But Elidibus was mentioned was he not. So why isn’t he in the codex as well?

Zodiark is a magical mecha suit with no agency of his own and is more of a plot device than an actual character.

Meanwhile Hydaelyn has been present and active since the first 30 seconds of the 1.0 introduction cutscene.

Can’t speak to why the others are missing though.

Hydaelyn is a magical mecha suit as well tho, with no agency of her own. Its only because Venat is still in her as the core that she has agency. Zodiark has been present since 2.0...so im not sure where that argument lies? Also, in the end hes the reason why the planet even continues to exist, not Hydaelyn.