I extremely like how well-thought-out this argument is, considering proposed parallels. But I see problems with it. First of all, we are led to believe that Kellhus doesn't pursue the Logos anymore. He poses that he abandoned it for the pursuit of the subjective, the divine and its domain, the Outside.
The second problem I see is one of the most important morals of the story, the one that holds Kellhus, with all his gifts, as still very much fallible. Him "sparing" Kelmomas is portrayed as a mistake, as something he didn't - in all likelihood couldn't - foresee leading to the later catastrophic failure of the Great Ordeal.
Well, Kellhus might have abandoned the pursuit of the Logos' ultimate goal, that of attaining the Absolute through it, but I don't think he gives up on the fundamental precept of the Logos, that all things could be leveraged via the intellect. In no way does Kellhus ever, that we can see, consider that a spiritual answer could help him. I think this is part of what Bakker is getting at, how the Dûnyain are so powerful intellectually and so weak spiritually. Consider what we finally hear from Kellhus himself:
“You were delivered to the machinations of the Tekne. And now you see it as the consummation of Dûnyain principles, the truth from which your very sinew and intellect are hewn. You think our error was to confuse the Logos with the movements of our souls, when in sooth it belongs to the machinery of the World. Your revelation was to understand that Logos was nothing but Cause as concealed by the darkness that comes before. You saw that reason itself was but another machine glimpsed in the blackness, a machine of machines.”
[...]
“You realized the Mission was not to master Cause via Logos, but to master Cause via Cause, to endlessly refashion the Near to consume and incorporate the Far.”
[...]
“But where you were delivered to the Tekne, I was brought to the Gnosis.”
[...]
“I seized temporal power, usurped the Three Seas as you have usurped Golgotterath. But where you saw antithesis in your damnation, a goad to resume the ancient Inchoroi design, I saw fathomless power.”
What I think Kellhus is saying, is that they both realized the the Logos, as a mission, has limits. That limit is essentially the limit of the soul. So, where the Mutilated saw an
impasse at Damnation, Kellhus instead doubles down, and attacks the issue of the Logos' limit via the Logos. So, Kellhus, here is actually chiding the Mutilated for thinking they had "answered" the issue at hand, thinking that the Tekne could answer the issue, the fact is that the Tekne and the Logos are
essentially the same thing.
What Kellhus brags about here is that he, in having gained the Gnosis (and so other metaphysical abilities), is able to leverage something beyond the limit of the Logos. Interestingly though, I think the Mutilated know this, in part, because it isn't as if they didn't learn sorcery. But they fail to fully double down, falling into the Inchoroi trap of believing that the Tekne can offer salvation.
Of course, the joke is on both Kellhus and the Mutilated, because there is still
more. Kellhus' plan isn't flawed in that it couldn't work, it's flawed in the fact that he failed to fortify himself spiritually. In other words, as a failed Abraham, Kellhus recognizes the need for sacrifice, but fails to make the necessary one. Of course, we want to ask, just as Abraham would have, why is this sacrifice necessary, but that is aside the point. If we need an answer, the plain one is because little Kel is the No-God, the whole time, so he must die. But that is beside the main point.
Kellhus doesn't really abandon the Logos, I don't think. He simply attempts to use intellect to conquer the spiritual, rather than just mastering all terrestrial circumstance. This is probably what Kellhus intuits (or perhaps knows) in killing Moe the Elder, who, like the Mutilated, cannot fathom the power of the Outside, because he imagines that the world is still a closed system. However, for all Kellhus' strong intellect he cannot make up for his spiritual deficiency though, in the same way that all the force in the world on the X-axis cannot counteract a force on the Y-axis. And in courting Hell, he opens himself to Ajokli.