- Emet’s words were in response to Alphinaud’s appeal to him to look to the present, rather than continuing to dwell on the past, explaining one of the reasons he wasn’t prepared to abandon his objectives. If it was thought that Hydaelyn’s ability to split the opponent would go no further than imprisoning Zodiark, it would make the sundering unintentional and the whole ‘lesser races would be untrustworthy’ argument wouldn’t have applied. If it was known that Hydaelyn’s ability to sunder would extend beyond Zodiark to the star and it’s inhabitants, it would make the sundering intentional, forcibly applying the effects upon everyone on the star whether they wanted it or not. Amaurot was only a single city. Is it possible that there could have been other survivors elsewhere on the star who may have had no knowledge of the ongoing conflict in Amaurot and, therefore, would have had this practically irreversible change thrust upon them with no choice?
Animals can act on their own. Human life isn't essential to the survival of all. And, as some here have already said, if given the option to sacrifice an entire Family of animals to restore the Human race, they would refuse it and leave the planet to the animals. So why would their talk of leaving their star to 'future life' necessarily discount non-human or common animal life?
- Isn’t aether the matter that primals require, with aether being described as the basis of all life? I’ll admit, I don’t know very much about it. Beast-tribes manage to summon primals (albeit incredibly weak ones in comparison to Hydaelyn/Zodiark which both used sacrifices of Ancients), not only through the use of crystals but also by their own sacrifices (shown in the Garuda and Titan (Hard) cutscenes). So for such beasts post-sundering to still be of some use to primals, the beasts which existed prior to the sundering may have held greater stores of the aether required.
- In truth, we can’t really say either way. I’d agree Zodiark would’ve expected a considerable quantity of aether, but whether they would’ve obtained this from further sacrifice of Ancients (seems illogical to me but it is a possibility) or whether they would’ve obtained it from immense sacrifices of other life on the star is still somewhat unknown.
- Plants not being the only possibility, but it would also depend how much is needed and how quickly it’s required. If such sacrifices did involve plants/animals it’s likely huge swathes of land would’ve destroyed. Perhaps some felt that such mass destruction of the planet (especially after the sacrifices just made to restore it) was a backwards step and that the star’s then thriving life belonged to the future generations to enjoy – not to Zodiark.