I actually wonder if the White Mages were the ones to create the Tonberry Retrovirus in the first place. Some sort of spell that wove water-aether deeply into a person's being to corrupt them into a new thing, and then there's the Curse on the Tonberry King that gave all of the Tonberries the Rancor... There's a lot there, I just don't know in what way it all fits together...