Guys please.

With ever email notification you get my hopes up and then crush them >_>

Thank you.

Achamian's dreams in The White Luck Warrior explicitly state that Seswatha was carrying on an affair with Anasurimbor Celmomas' wife.  Seswatha also seems attached to Nau Cayuti as though he were NC's father.

An I mentioned that for this to work, Kelmomas' wife must be Anasurimbor as well. Which implies incest in the family. Was it ever mentioned in the books? I don't doubt that Bekker can easily introduce such thing, it is just usually he does not do that without preparing the ground or putting clues or hints there and there. No deus ex elements.

another possibility is that we do not know Seswatha's heritage (iirc he was an orphan) so he could be the classical fantasy 'hidden heir'.
In support of the hidden heir supposition, Seswatha and Anasurimbor Celmomas are the same age and Celmomas had a twin brother who 'died in infancy.'

"Hidden heir" or, in another words, "Retrospective Continuity", which usually takes place in b-grade literature when author wants to make a sudden twist in the boring plotline or justify some holes. No offense but that is not Bekker.

Madness

We know this actually - Bakker asked a question years ago on Zombie Three-Seas. I wouldn't want to be the person to spoil it for you and it's ulterior to what I actually meant:
When the Nonman tells Kellhus he recognized him as Anasurimbor, he fumbles with a particular face on his cloak. I was wondering who that Anasurimbor was?

By all means, spoiler away, I have no issues with spoilers at all and I'm greedy for some information related to books that is not in the books.

The Dunyain Anasurimbor are the offspring of Ganrelka's Bastard.

I think I missed where it says so. I thought Kelmomas sent his own son into Ishual, as he was telling to Seswatcha one day?

However, I doubt it. I think Kellhus being Anasurimbor is extremely likely. Though it also likely that he is not the one the prophesy foretold of. He might not be the Harbinger.

Yeah, I don't think he is Harbinger and the one that prophecy was about, in fact, I think he will be the one

However, who was that nameless face woven into the cloak?

You mean - who was that Nonman Kellhus encountered? I don't think it matters,  all nonmans are over 2000 years old, all they carry ancient knowledge of these days. Except these who went insane.

Because if not, then we might assume that all the Dunyain are Seswatha's descendants, not Celmomas'.

This is correct only under circumstances that Seswatha is Anasurimbor, but books never mention anything like that. Otherwise there is only one way: Kelmomas's wife was Anasurimbor as well.  Eowa has their own Targariens?