I think the main point to take away from the Sranc ---> Inchoroi comparison is that, in reality, EVERYTHING is just "another variety of Sranc". I don't remember the exact line but the text more or less states this outright. Men themselves are a "weapon race" just as any other, driven by their own particular set of desires (and basically all the races -- Sranc, Nonmen, Inchoroi, even Gods and Dunyain -- are subject to this).
The Dunyain's vast intellect makes them no less subject to the Darkness that comes before, as illustrated by the Apocalypse of Koringhus. The Dunyain "feed" on knowledge and the domination of circumstances just as Sranc "feed" on violent congress, etc. The Mutilated see the Ark as a genuine religious object (even if they do not think of it as such). They see the Absolute as a prize, or something to be achieved, when in fact it is yet one more carrot on a stick.