That's one theory, Moose, and I can definitely see it. I have another, though. Emet-Selch tells us that the Finals Days were brought about because something (our famous "sound") caused the Amaurotines to lose control of and ultimately be destroyed by their own creation magic. Even Zodiark, the supposed solution they Created, immediately mind-controlled everyone who summoned it, which I doubt was in the template, you know? Either way, creation magic run amok certainly well-describes the Primal threats we've faced. Is it possible the Amaurotine doom is still colouring the Summoning arts?