I could handle G'raha Tia's time travel shenanigans, but the stuff with Elpis I just cannot get behind.
First of all, it is all but confirmed that the Warrior of Light's presence in the unsundered star did have an effect on the future, as Venat as Hydaelyn does remember the Warrior of Light from the past. Nobody else does for some reason; Meteion, as the largest example, is surprised when we know Hermes' name, even though during that span of time we interacted with Meteion more than Hermes did.
Additionally, while it's also implied that the sundered souls inherited some of the personality(?) from their Amaurotine selves, this manifests nowhere even though the Warrior of Light was seen by, conservatively, a few dozen ancients in Elpis, who likely should have spoken of the sightings of 'Azem's Familiar' or even talked to him about it.
Branching off of that, if the Warrior of Light being handwaved away in Elpis as Azem's Familiar was made aware to more Amaurotines than the one who were mind wiped by Kardion, wouldn't query of this have reached Azem themselves, or at least some member of the convocation?
Would Zodiark contain a soul that knew about the Warrior of Light? Would this have influence how Zodiark acted in the WoL's presence? Would they know they had a connection to Azem even while carrying Azem's funny lemon-flavored crystal that can summon the Scions back from the dead?
I blame Elidibus for all of this. Time is a flat circle.