Honestly, at this point, does it really matter who's right and who's wrong in this argument? There's no reason to nitpick every little post to death; this whole back and forth just comes across as petty arguing for the sake of arguing. It really detracts from the overall quality of the thread and has thoroughly derailed discussion multiple times already. The problem has only been exacerbated the further you wander down the rabbit hole into off-topic territory in further attempts to win an increasingly tangential argument. Even if you're hypothetically one-hundred percent correct, too... it's still making the thread more of an annoyance to read.
I prefer to lurk but I even I couldn't help but comment. I'll give my two cents on the story so I'm not a hypocrite propagating the derailment issue; hopefully I can bring something fresh to the table that you all haven't touched on already.
Dynamis to me feels written in to the story to justify the Sundering. The Ancient's plan to sacrifice wildlife in order to resurrect those that had been sacrificed to Zodiark feels completely reasonable, and that's ultimately the problem—the writers knew Hydaelyn would need a stronger justification to Sunder the star. Dynamis was the band-aid that was intended to make it the objectively morally correct choice, but then this leads to contradictions in Venat's motivations. We are presented with two reasons why Venat Sundered Etheirys: one being the need for Dynamis-sensitive beings, and the other being that she felt strongly opposed to the third sacrifice, but these don't quite mesh together well under scrutiny. If Venat intended to Sunder the star for the purposes of Dynamis, then why would she feel the need to wait until two sacrifices of her people had already taken place? Especially if the idea of a third is bad enough in her eyes to serve as a secondary motivator altogether. On the other hand, if Venat Sundered Etheirys primarily to prevent a third sacrifice and resist Zodiark then how does Dynamis factor in at all outside of convenient coincidence? And how, in her mind, does irreparably Sundering her entire race somehow seem like a better alternative to sacrificing just a fraction of them (and then some wildlife to restore the sacrificed)? The only scenario in which the two motivations can co-exist is one where Venat specifically waits for Zodiark to be summoned because of her knowledge of the future, knowing that he'll shield the planet for 12,000 years until her champion can be born, but then that raises problems of its own. Firstly, allowing a second sacrifice to Zodiark becomes unnecessary from Venat's point of view. Secondly, that would make Hydaelyn a sadistic, scheming psychopath that worked behind the scenes pulling strings and knowingly withholding information from the Ancients in order to inflict maximum suffering upon her own people to meet her own ends. How's that for despair, Emet?