It has a succession problem: Grull is one of the few trueborn heirs, and his own father doubts he should rule the heavens.
Grull's system card fills in what the Cookbook only sketched. He is the child of Taranis and Apito, and one of the few trueborn heirs to the Celestial Ascendency — meaning the twelfth-floor god game is not only a pay-to-play arena for sponsors but a dynasty with legitimate bloodlines and a contested inheritance. Taranis worries his son's temper, an angry streak as long as a horse's cock, makes him a poor choice to rule the heavens, and finds the equine cast of his worshippers a bit unsettling even for a god.
The sponsorship layer sits on top of all this: below the twelfth floor these heirs cannot be hurt at all.
The gods' own game, revealed to have trueborn heirs and a succession dispute.