I think the capital should be kept growing to size 6 so we can efficiently produce settlers by whipping 6-3. We're behind, my opening seemed to suck, we need to prioritize growth to catch up.
The gems is pretty clearly "his" spot, it's closer to him, there's an ice bar between us and the gems, and I really don't want to start an ancient era fencing duel with Zulu trying to block off settling sites.
We do need to play after him this turn though in order to kill the Impi if it moves past our Axe, priority is to protect ourselves from harassment. I will also offer OB when I log in.
We want to show peaceful intentions. He holds all the cards now; our leader gets stronger later in the game. If there is a fight to be had, it's after Knights or Maces preferably.