Allow me to quote an earlier post of mine I made after reading TJE and I'll elaborate on it after:
The outside mirrors the mundane world on several levels. Akka observes that the differences between the Outside and the mundane world is a matter of degree and not actual substance. Even Moe and Kellhus, the first after decades of observation and the latter from firsthand study, observe that the outside is a glorified battlefield of warring factions.
Apparently your mundane life merely sets your position for the afterlife. Inithrism gives you a path to cozy up with a god of your choice in the hopes that they can protect you once your soul finds its way in the afterlife. This only applies, of course, to the compensatory gods. Gilgaol, the god of war, who is not a compensatory god would have otherwise taken the Captain under his protection. Zuem bypasses this by setting up ancestors together in similar groups that can watch for one another. Zuemi doesn't deny the existence of the Hundred, they just believe your own kin are more reliable allies in the Outside. This coincides with Kellhus' observation that the Outside is nothing more than innumerable factions warring amongst themselves.
By contrast the few that bruise themselves seem like they just mark themselves for any Ciphrang that is strong enough to claim them for an everlasting snack. This could explain why Cishaurim don't bruise. The Tusk specifically condemns sorcerers as an abomination. Fanism specifically exalts the Pshuke as being closer to the Solitary God.
After some contemplation here's my current theory. At one point one of the characters, I believe it was Kayutas, notes that the Great Ordeal is nothing more than a vehicle to transport the thousands of sorcerers. It's also noted that Topos are, quite literally, gates into Hell. The greater the Topos, the closer you are to the Outside. You're essentially in the Outside at that point on varying degrees. Kellhus' entire plan for the Ordeal is to take the entire expedition to the largest Topos in the world and... just stay there. At that point he'd have an actual army in the Outside backed a core of sorcerers in their thousands. Whatever Zauduyani survive would be able to help as well. We know that the Gods and Demons all value and collect human souls so they must have some purpose in the Outside. From there Kellhus builds strength by dominating the lower Ciphrang, recruiting tormented sorcerers' souls and begins building a mansion strong enough to eventually challenge the Hundred. Since it appears that the Hundred are just more powerful and more legitimate Ciphrang, the Dunyain axiom of dominating circumstance must extend logically to dominating the Hundred. Likely human souls, Nonmen souls, Ciphrang and even the gods are all essentially the same in the Outside.
I believe I'm still generally on the right track. I always go back to the notion that the outside is fundamentally no different that the normal world. The two worlds differ in degrees only. One amendment to the theory is the how eating the Sranc is affecting the thoughts of TGO. I believe this is intentional. Kellhus is priming the Ordeal to think a certain way that is conducive to mastering the Gods in the Outside much the same way he was priming Proyas. I suspect for Proyas this as to force him to accept that he will be literally required to murder or dominate the gods he loves so much. For everyone else, a frenzied violent mindset seems to be what works in the Outside. That's certainly how the Ciphrang and Gods seem to handle business.
To put it bluntly, if Souls are ,for lack of a better term, currency in the afterlife, then what's stopping Khellhus from storming in there with his own army of souls? That's part and parcel of the Dunyain schtick. All interaction are hammers to temper people into useful tools. The Thousandfold Thought was described as a pattern repeating itself within a larger pattern and IIRC it was also identified as an Empire made as Kellhus' soul or something like that. So these crazed Ordealmen are now primed to repeat the pattern that is Kellhus' sould in the outside. Then the pattern that is the Ordealmen will force the other factions in the Outside to confirm to the same pattern. In short, TTT is the pattern of Kellhus' soul forcing itself into a larger pattern or the Ordeal forcing itself into the pattern of the outside-- ie the unmoved soul ie The One God, the title for the next trilogy.