No, thats basically it.
The ancients, the convocation and a majority of ancients, sacrificed themselves to summon/keep Zodiark summoned to stop the Final Days triggered by Metion. All the sacrificed Ancients 'souls' are represented by all the faces in the cutscene with Zodiark, and even Emet when he transforms into Hades, and shows them as the representation of the masked faces. These are the ones that are actually dead, dead.
All Hydaelunie, and her group of ancients, did was shatter everything from 1 singular existance into 14(13?), so that life would have the chance to continue unimpeeded by the Source experiencing the Final Days. So, no one was technically killed by queen crazy, as much as they were splintered into multiple fragments with one fragment on each of the 14 (or 13/however many) shards. And then life from those fragments would be 'new' life.
And all of that occured because Hermes couldn't not into being emo for 5 minutes because muh existentialisms.
So the way the story goes is, Hermes created Metion and she ventured forth into the unknown to find the meaning of life - which she concluded was death, and entropy as all things decayed.
so Metion went crazy and decided all life has to end, and started the final days for the ancients, and no one could figure out what was causing it so they summoned Zodiark to protect them, the root of all corruption wanted to find another way so she sundered everything, and then magically the events of endwalker take place to put us the WoL in the path of direct opposition to stop the Final Days from occuring and to make it so that hyperpsycholyn could know what caused the Final Days, which somehow makes us 'worthy' and she could finally die by creating a time loop paradox that ensures life will always survive should the WoL fail.
at least until Pandeamonium, the laboritory out of time, is resolved and a special person involved in that story arc resolves the time loop paradox and will then act as the next Hydaelyn. (personally I think anyways)