Perhaps the appearance of the God of Time and Space and William was always just a tributary on the river of destiny for Teraxil; whether a glimmer of hope could be found depended on Teraxil finding this junction himself.
They were surprised because the origins of the God of Time and Space were uncontrollable... Although possessing the ability to extract souls from the World Without Magic, careful selection was not something anyone could accomplish.
They could only roughly provide a general set of conditions, and then choose randomly among the souls meeting those conditions that could be taken away, selecting one they felt was the best.
If, back then, the soul brought out by Uranus hadn't come from the young nation from the East with the God of Time and Space, Teraxil might still have had a deity who could lend him a hand, but it wouldn't necessarily have resulted in the emergence of the Undead Tribe.
