I disagree, when we see Moenghus we even get to see his lab with Skin-Spies being experimented on.
What we see is a primitive man with some iron tools in a cave, and you are suggesting that he managed to make the leap to futuristic power sources and gene manipulation. I think not. The skin-spies are Tekne, and no one but the Consult have that.
If you want psukhe magical skin-spies, fine. Just add it to the list of impossible things that the super-moenghus theory entails. But, why stop at these half baked skin-spy replicas? Whats the point of making spies with a weakness? Just make them have real faces that change with super secret, undetectable, undefeatable meta-psukhe.
And then, why bother having a war at all and risk losing? Just make an army of these flesh molders out of your army of Cisharuim and replace every single general, King, and advisor in every 3seas nation, then have them pledge fealty to the all powerful super-moenghus. While he's at it, why not do to all the schools as well. All hail mighty moenghus!
If Moenghus was so powerful, the story would have been about him taking the 3 seas and doing whatever it was he wanted to do with the Consult. But Moe died, and the story is about Kellhus.
The unmasking of the sorcerous Skin-Spy removes all questions to Maitha motivations ... It's the very reason Maitha turns up and "escorts" the Mandate to shimeh.
Moenghus tells us that Maitha is part of his plan. There is no mystery here
in the same way Kellhus saying his name and dreams to Akka silenced his.
??