A nice theory, but as far as is known, beastmen only worship a single Primal, and the Ixal Primal is already well known and in the game, namely, Garuda.
Although having said that, your idea about Quetzalcoatl might open up other possibilities, given the Garuda story makes mention of her fighting the evil 'lord of snakes', and Quetzalcoatl in Aztec myth of course is the feathered serpent. *Ears perk and rubs her chin* Bugger, now I'll be thinking of this idea for days!![]()