While we're on the subject of folks bringing the Horrors on faster, could Wuxing be helping out too? I mean, they have been manipulating the dragon lines and increasing/encouraging the astral shallows around their bases. Sound sto me like someone there wants to bring something over faster than it's supposed to.
I don't know about that; I've always looked at it more like Wuxing is building a magical security network around their operations. After all, aspect the local manasphere to your particular flavor of magic (say, wu jen), and it hinders anyone going against the flow (like a hermetic or shamanic magician). No spirits to banish, no ward to break, just a constant background count that favors your guys. Of course, that's not to say that fiddling around with the astral like that
isn't hastening the approach of the Horrors, I just don't think that's Wuxing's MO. On the other hand, that seems to be very much Aztlan/Aztechnology's prime motivation (or at the very least, some significant faction thereof).
I very much like the idea of fovae being a defense mechanism, though. Totally gonna steal that. Actually, that might be behind Wuxing's encouragement of them; any purely astral form passing through an astral shallow is visible to anyone else in the shallow, including mundanes (in theory, at least). The astral equivalent to clearing the brush from your fence line, if you follow.