OK I wandered back here due to a different thing I was doing for a friend. I was trying to choose an AI pretender. What I found didnt meet my needs but I thought Id put it here for anyone still looking to fill in the SemiRand AI pretenders.
The Watcher
http://dom3.servegame.com/wiki/Watcher
It has decent stats, and a patrol bonus of 50. Its immobile, but a leadership of 40. If given no magic then it wont be of any use except to patrol. I havent tested it but Im hoping that it would provide a forced patrol for a nation that needs it without a chance of the god going to war or arena. And if you assign a number of castle-defense-bonus or patrol-bonus units as bodyguards then even better.
Oh and I see no one ever asked about the previous tests to remind me.
The AI isnt totally mindless. Simple yes, but not mindless. Apparently, the AI recognizes some pretenders as SC's and treats them as such. It fills their army and sends them to war, and sends them to arenas. Rainbows, or some decent thugs that are fairly man-sized, dont seem to get that treatment. Or at least are safer for longer.
There also appears to be some safety in not choosing units with leadership. I am still planning to test if a mobile god with leadership can be pinned down by giving it immobile bodyguards.
Immobile pretenders appear to be the safest.