Originally Posted by
CKNovel
There is a difference between G'raha and Elidibus ways of traveling through time.
G'raha transported the whole crystal tower with him, Elidibus created a portal and only sent the WoL's consciouness.
I don't think it was ever said that G'raha couldn't return if he had sufficent aether, only that his timeline could never be saved.
The point of visiting Elpis was to learn the existence of dynamis and Meteion.
It wouldn't have much impact, visiting Venat in the present she could've said "Oh, you visited the past, you know everything then. I know where meteion is, I've searched the space during all these years, here are the coordinates"
As for Emet&Hyth come back from the dead, I really liked it but it brought nothing. It was purely a fan service scene.
They could have removed the last step with Meteion saying "You're finally here but you're alone now", then the WoL summons its friend and Meteion be like "oh no, power of friendship my only weakness".
I really don't like to say it but a lot of the writing was sacrificed for the sake of fan service.