Was weak.
1. She did much more than incite panic when she engaged in civil war and sundered the world, so that personal belief of hers about the situation rings hollow.
2. She's acting as though Hermes is the only individual on the entire planet that knows about Dynamis. It's like saying Niels Bohr was the only way forward in Quantum Physics, when he had contemporaries he worked closely with to perfect mathematics and theories (such as Heisenburg, the guy credited with Quantum Mechanics). She's also acting like she doesn't have the time to seek his tutelage. Why not become a genuine pupil of his, very readily interested in Dynamis and the construction of Entelechies? He doesn't need to know why.
The premise of this thread is intrinsically flawed. Zodiark wasn't constructed to be a solution for Meteion. Just a solution for the observable phenomena for which we know she is ultimately the source. Zodiark was basically constructed to combat her shadow, nothing more, because the Convocation wasn't given the information about her.
As for the Rejoining mechanics, the crystals observed are deaspected which means they've lost their elemental polarity, rather than their umbral or astral one. They don't have less aether, just no element. That's what Y'shtola observes. The portion around Wilred was inconclusive ambient aether recordings. The researcher is musing, "Is it because of the primal(Odin)? Or something else?" When he stumbles about the young Ala Mhigan that has come down with a sudden case of traitor's blade in his gut. I'd surmise that the aetheric imbalance in calamities forces aspected aether to shift to fulfill the elemental strain placed on the Source by the primed Shard. Aether levels in the Source actually always rise, it's just a shift and disturbance can be noted, because the shifts are dramatic.
Think of it like the tide rushing out, suddenly decreasing the water level on a beach just prior to a tsunami. An astral aspected calamity likely caused an even more dramatic low tide, as it were.