By the twelfth prince the pattern has been said so many times that it has stopped being information and become liturgy. The repetition is the point. A thing said once is a fact, but a thing enacted twelve times, precisely, across twelve days and twelve men, becomes a structure you can stand on. Ritual works by wearing the same groove until the act no longer depends on the mood of the one performing it.
Ahira comes last and adds nothing new, and that is his contribution. He completes the ring. The reliable man does not improvise a grander gift when his turn arrives; he does the ordinary and necessary thing, in full, when the whole depends on him closing it.