Cheers Wilshire and locke.

First, Kellhus didn't really fail in the context of the Thousandfold Thought, anymore than Moenghus failed. They both did precisely what was needed and became surplus to requirements.
“You shall be my goad, the scourge of nations. Children shall keen for the simple rumour of your coming. Men shall rage and weep. And whatever horror and anguish you should sow, I shall reap.”
Bakker, R. Scott. The Unholy Consult: Book Four of the Aspect-Emperor series (Aspect Emperor 4) (Kindle Locations 7742-7743). Little, Brown Book Group. Kindle Edition.
Ajokli didn't need the Consult to accede, he was just telling them how it is. He eliminates the Dunyain that grasps certain things about what he was doing and then let them think they had won.
Cue Cnaiur's ascension as Ajokli into the Whirlwind and we see that
the Scylvendi were right all along. As they watch, Lokung strides into the End of the World, born as his siblings are stranded blind in the Outside that extends across the rest of history.
Regarding the blindness of the Hundred - it is stated that they rationalized other explanations for the events of the First Apocalypse, but the implication is quite clear that they could not understand it in truth nor intercede in any fashion. The no-god collapses subject and object, closes the gateways in preparation to seal them as it counts and extinguishes the subjective souls remaining inside. No more babies means the amount of Subject cannot increase, and means the Subjective can no longer manipulate the hinges of creation. (Note that standard sorcery still works because it relies on manipulating reality from its Objective side)
Prior to TUC the origin of the Celmoman Prophecy was hugely problematic, causing many readers to assume that the Hundred retained some agency - doesn't need to be the case anymore if Ajokli remains ensouled in the Objective.