I guess with a stadium with seats in the corners you either have a bigger single-tier stand that wraps around and cuts into the two side stands (as we've done)
or you have a smaller single-tier stand with the side-stands wrapping around to meet it (
which is what Meis is doing for BMD).
There's no smooth way to merge a double or triple tier into a single tier. You'll end up with blunt points or concrete walls somewhere. Maybe we just need a lick of navy paint or some banners or something.
Actually, I hadn't noticed this before but the BMD single-tier seating plan is not at all dissimilar to the way the single-tier end was incorporated in our first design: