Interesting. For some reason that much overlap bothers me. Probably something I need to get over.
Anyway, this game has become VERY interesting. Just as I took Wash and Toku's last cities on the east coast (Toku snuck one in over there), Mansa invaded. I was struggling hard to keep York (town just off the screenshot to the south) and Cambridge (settled at city option 1 in the screenshot) for awhile. We kept trading Cambridge back and forth. He wouldn't give in, demanding one of the two cities when I'd seek peace. I finally beelined to rifling, pushed him back, and now I've taken his two largest cities.
So I think I'm finally getting a handle on Noble, post patch.
I may post a save later to see what people think about how I handled Mansa's invasion, tactically and strategically speaking.