Light and Dark

[treuhavik]

It's my belief that the worlds trend naturally towards neutrality, as an excess of aether makes using it in large amounts easier and vice-versa.

I'd like to agree with you here. It's also possible that each dimension (source & reflections) has their own "natural" balance of darkness and light. This could be a result of their degree of separation from the source or something to this effect.

So there's the question of how you put a lot of aether in the system. Aside from stopping it's usage for primals, there is also possible genocide against the beastmen and monsters putting their aether back in. If their Allagans had imprisoned more eikons then their sudden defeat would cause quite the surge that the world is not prepared for.

If I'm understanding correctly, you're positing that the defeat of primals/eikons would cause a rush of aether, imbalancing the aetherial sea. Though, while deceased life forms do release the aether that comprises them, which then returns to the stream, the aether consumed by primals (eikons included) becomes corrupted and is, at most, harmful; at least, ineffectual upon reentry.

I'd like to say that life = light, and life begets life. However, that and most other solutions to this equation that I've suggested seem to contradict other implied laws of it. It's certainly a difficult puzzle.