Simas Polchias:
- I like that visual of organism/disease, and Kellhus preparing the Ordeal for the true atrocities ahead is also great.
- I'm not sure if we have any direct correlation to the Womb Plague and the death of anyone other than the mothers (and their stillborn children, but I suspect something metaphysical with that)
The Sharmat:
The Consult need love too

. Your more playing devils advocate than just cheerleading the Consult. There is a reason Kellhus spent decades planning this assault, and it wasn't because the Consult are a foe he plans to beat easily.
I'd argue that the Mandate, while important, are the 'old guard' if you will. Schoolmen from yesteryear, sworn to Seswatha and no-one else. Might be that Kellhus thought they were a bit of a wild card.
Below is kind of tangential and only loosely ties back to some of your statements. It doesn't really fit into "side effects of eating sranc" but I'll drop it here anyway:
The text is conflicting about how much of the school was destroyed, but certain the lose of the Grandmaster was devastating as he was likely far and away the strongest. I still think, though, that everything of vital importance is held fast to Kellhus, making his army, those generals, and the Swayali, the most key pieces. The rest, I think, are more or less pawns, or maybe even rooks/knights, but still all pieces he is willing to gamble.
The Consult wouldn't dare send their first big surprise directly into Kellhus' arms, and both Kellhus and the Consult know this. So if not Kellhus, destroying the army full of their old enemy, the Mandate, who also appear to be the strongest schoolmen, is a great 2nd choice. Sure, the other army protected by the anagogic schoolmen would have been a softer target, but they aren't really concerned with losses. For maximum damage before they release the big guns, getting rid of the Mandate is certainly worth the cause.
Kellhus probably wasn't able to predict how/when/where the Consult would try to launch a surprise assault, so he needed to bait them into doing it in a controlled way. I think Kellhus sequestered away whatever secrets he couldn't hide within his grasp in the other in-tact army.
I'm going to guess that the anagogic schools, which have been dismissed in everyone's minds as inferior, have taught something of extreme power by Kellhus. Whether he has given them the gnosis, or the means to developing their own, or some kind of meta-diamos, or anagogic-gnostic hybrid, I think they are a surprise waiting to happen. What better place to hide a secret weapon than with those that no one believes are capable of wielding it?