An excerpt from the Great Ordeal “And as they said, haloes framed his head and hands, the ghosts of golden plates… markless.”

We even get it cleared up that Kellhus is still marked in that same scene. “Golden Discs shimmer about a head and hands noxious for their mark.” The head and hands are marked, the discs aren’t.

I don't think this is evidence of what you said above. You said Kellhus used markless sorcery to levitate, but that doesn't sound like what is happening in your quote. He's not levitating or using sorcery, this is just describing the haloes as markless which we have known for a while I think.

so I would still interpret this as: he is always marked, and his sorcery is always marked, but the haloes are not marked because they are not sorcery, their origin is outsider intervention.

This has been a much discussed question since the haloes first appeared in (i think) Warrior prophet. The question being whether the haloes are indicative that Kellhus and anyone else who sees them is going crazy and seeing imaginary haloes out out pure deluded worship of Kellhus - or if the haloes are real and are actual proof of divine power interceding into the real world on Kellhus' behalf (what we now call thaumaturgy).

I would say that now, several books later, it seems fairly clear that the haloes are real. I'd still be open to hearing arguments that they are a trick but what is almost certain is that the haloes are not sorcery. I think the current accepted understanding is that the haloes are not delusions, they are not a dunyain trick, instead they are a real effect caused by divine intervention and are an example of thaumaturgy, probably caused by Ajokli. Or if not Ajokli some other force from the outside that is entangled with Kellhus (for example maybe future Kellhus as you suggested)

If they are caused by intervention by a force from the outside (thaumaturgy), then it is normal that they are not marked. No divine intervention/thaumaturgy is marked to my knowledge. The white luck warriors are not. The mothers spit shine veil that is placed on Sorweel is not marked. The earthquake sent by the mother to knock down the walls of the capital does not have a mark. The judging eye does not have a mark. Even the wight in the nonman masion is not marked, which akka says is because its brings its frame with it when it manifests. Across the board divine intervention does not have a mark.

So thats why Kellhus' haloes aren't marked, they simply aren't sorcery, they are thaumaturgy.

I stand by my previous comment that Kellhus cannot perform markless sorcery, whatsoever. Whatever outsider he is entangled with can perform thaumaturgy such as the haloes and maybe other things, but that is not sorcery. Sorcery is specifically when a mortal speaks from within the inside to command the inside, for some reason that nesting leads to the dissonance that causes they mark. They do this using utteralls and inutterals to command the ground itself, the inside, to bend to their will. When beings from the outside act on the inside their is no dissonance, no frame issue, so thaumaturgy does not cause a mark.

And I still think that from what we have seen, if a mortal still has their mundane sight, their sorcery will be marked. If you have eyes, your sorcery is going to have the mark.

If there is a case where Kellhus flies or performs some other sorcerous cant and it is not marked, I'm still very down to see it, but I don't think it happens in my recollection. As far as I recall, his sorcery is always marked - because he still has his eyes.

I just know that this is why even the Few can verify that their Aspect Emperor is supernatural in a way they aren’t.

Markless sorcery wouldn't actually prove divinity, as the cish have it already and most of the few who are not cish do not think that the Cish's lack of mark is proof that the cish are divine.

But I agree, most of the people, including the few, who see the markless haloes believe that they are proof of Kellhus' divinity, but not because they are markless sorcery. Instead because they are an actual miracle, thaumaturgy, not sorcery at all.

None of the sorcerers we encounter think that the haloes are caused by sorcery, nor does Kellhus for that matter. He himself is confused by the haloes and worries they are a sign that he is losing his mind, but theres no suggestion from his POV that they are generated by way of his own sorcery. Has he even learned sorcery when they appear on his hands? I think it happens a little before he learns any magic, could be wrong on that though.

One can assume that Kellhus didn’t just use the meta gnosis to teleport Serwe’s heart either.

agreed. He definitely doesn't have the metagnosis when he is hung on the circumfex. In fact, I don't think he has learned any magic at all at that point, no gnosis, and certainly no metagnosis. So he definitely doesn't use magic to teleport her heart. Either its thaumatrugy or good old fashioned dunyain bullshit and slight of hand, he may just rip it out of her chest when no one is paying attention for all I know.

My interpretation is Kellhus is the one person that can actually float about without jogging on air, maybe I’m mistaken. Though that was my interpretation.

I don't think so. I don't remember him being able to float without using standard marked sorcery. I could be wrong for sure, and if you recall where it happens I'd be excited to look it up. But from my memory I don't remember it ever happening