I'll take a stab at some of these:
1: Skin spy protecting Mimara:
I think this gets more thought than it needs. Like, Aurang gets called out to the middle of nowhere by a skin spy. I think he just makes a snap judgement that whatever they are up to can't be bad for Team Consult, but maybe if Akka finds out about the Dunyain and shares the info this could hurt the Ordeal's morale. (worth noting, from Consult POV all prophecies are ultimately 'false', since the No-God will rewrite destiny when activated.)
2: Ordeal in general:
Once again, I think the surface level is the only one we need to worry about. They are there to destroy the Consult's minions, keep Kellhus from having to fight Erratics and Wracu while he unleashes Ajokli on the leadership.
3: Ordeal's rape, eat each other and such:
Again, I don't want to read deep here. They were going mad with Sranc, the atrocities were the only way to keep them heading the right direction, betraying Proyas afterwards was useful for fixing their morale.
4: Kellhus' plan
Pretty much what we see: He intends to destroy the Consult, thus aborting the No-God and saving mankind. He means to use his army to defeat theirs, and Ajokli to destroy their leadership, having reasoned that the Golden Room will be an uber Topos.