Is It Even Still Possible (The Rejoining)

[Styrmwyda]

I think that the Ascians could have found a way to eventually fix the Void.

The real question is - after all 13 shards had been rejoined to the Source - would Zodiark have been able to actually resurrect the Ancient Amaurotines who sacrificed themselves for him? The Convocation were tempered, and according to one interpretation of the pink crystal "this power feels so right", they may have been tempered immediately upon summoning him. Aside from Hydaelyn and Phoenix, almost every Primal we've come across is motivated towards self preservation first, and the safety of their people second. It could be that Zodiark just told the Convocation what they wanted to hear. I have no doubt that a being as powerful as a 14/14 Zodiark fueled by thousands of Ancient 14/14 souls would be capable of creating beings in the likeness of the Ancients, but would it actually be them? We haven't seen any examples of true, "yes really" legit resurrection of the Soul in FFXIV.

Maybe it might be like a Fullmetal Alchemist thing, were once Zodiark is defeated, all of the souls he contained may finally go to Heaven/return to the Lifestream. Perhaps they might reincarnate one day. But I find it hard to believe that Emet and Elidibus would have ever actually gotten their friends back for real.

You forgot Alexander, he sacrificed himself because he knew that a perfect world would be impossible with him in it (as he would drain the world barren just by existing). There is also whether the tempering was intentional or not, like with Ramuh.