On the topic of whether Zodiark could grant the Ascians' request to resurrect their fallen comrades, that's very hard to say. We don't know the full extent of Zodiark's power. We also don't know anything at all about his personality, and whether he'd be the sort to lie to his summoners for some unknown personal agenda. The Ascians clearly believe he can do it. Their reasons might be baseless (lies by Zodiark, or Tempering-inspired exaggeration of their deity's power), or grounded (they did create the guy, after all, and might actually know what he's capable of).

Personally, I believe that Zodiark is fully capable of everything the Ascians say he's capable of, simply because it makes the story more poignant - that everything they wish for CAN be made a reality, but making it so requires inflicting so much evil on the worlds.

Quote Originally Posted by Lusavari View Post
Sure we recovered it, but at this point, The Scions have known better than to blindly trust Hydealyn since Minfillia became The Word of the Mother. What Emet Selch and Elidibus have taught us have served only to further our own distrust of what Hydaelyn ISN'T telling us, because we know she's keeping something secret.
I don't recall the Scions expressing any suspicion of Hydaelyn at any point either before or after Minfillia became the Word. Not even after Hydaelyn was revealed as a PRIMAL have any of them openly expressed any doubt in regards to her, as much as, logically, they SHOULD. Though, admittedly, this is in part because they don't seem to talk about her directly at all, anymore, and it was pretty much just Minfillia that talked about her back in ARR.

The only ones expressing any doubt about the benevolent nature of Hydaelyn are players - and not even all players. There's nothing canonically in-game about anyone harshing on Hy aside from the Ascians, and they are notably biased.