Bon giorno!
Ahhh, what a restless, CIV-encumbered sleep can do for one's thought processes...
mdy, I believe the puzzle pieces have all fallen into place. My new conjecture is that Sal, who traded us Mono, was the one to found Judaism (d'oh!), in a second or third city near Toku. Thus, MysteryAI probably has NSR or is Buddhist, and is beyond Izzy, trading Zara corn. MAI also has the GW, which might not be insignificant if he is to Izzy's north, because he'd repel any remaining barbs toward the south, where our warrior/settler would be going. Depends on how big that landmass is. Anyway...
If true, this means with virtually no effort we could have a block of 3 AIs in Buddhism, with Izzy being super-easy to get to Friendly, if we want that. Then we put our missionary-spamming efforts into Toku and Justy. Religion- and wonder-rich Sal becomes our UN opponent.
I'm under the assumption that we can still gift the UN city to make someone else our opponent. Is that right, anyone know?
This is, of course, just an idea for now, but it would make sense. Later on, we'd have to be prepared to gift Sal a city safe from Toku's conquering hoards, and we would want to be the ones to capture his shrine cities.
-----------
In short, I have gone over to the Dark Side, Mutineer.

I'm fine with continuing as per our plan and leaving the dyes to them, at least for now. But there are some consequences, imo:
1. We'll need to get Buddhism. Hopefully, Ivory will pick this up, being close to Madrid. Ivory w/Moai would be a great miss-spammer later on.
2. We will need to switch to Conf before we even have Buddhism, which means:
a. our wb needs to get beyond Toku asap
b. we want to scope out Izzy's and Toku's lands asap, because they won't want to trade us their maps.
3. We need to make sure we have something to trade to Izzy when she hooks up her second dyes, or else she'll trade them to someone else. That also means we need to have Buddhism spammed to our cities by then, so we can switch from Conf. That's a challenge.
Again, all tentative, but it's a workable strategy.