AI isn't very good with Kupe. Except in my games he's pretty strong culturally. Though he lags in science, so once you have something that can stomp his UU, you will be fine. I find him often stomping on other AI's with his uu. He hasn't had glacial or 1 tile starts in my games, but plenty in other people's games. I did see him on a medium island one game, then expanded on the mainland, then stomped on Eleanor. She was down to 1 city, later in the game I see she's up to 3, I assume from loyalty flipping.