Yes. huge bad on my part, mistaking nine for eleven. In my defence, I cite stupidity, parity error and failed arithmetic in kindy twice.

The eight-vs-nine thing, very quickly becomes the ten-vs-elevn thing in larger widebody jets. Its a double squeeze: both on the functional seat width, and on the consequence of 3 or 4 or 5 abreast seating and the middle seat passenger.