Yep -- Discopapa -- that's exactly what I'm seeing.
There's 6F unoccupied on the seatmap, but I'm X of X for 2 free seats on the list.
Now that I know how it works, maybe I'll go back to that other thread where I can be unhappy about it (since it kinda looks like I'm going to be on the bubble where 12F vs 16F will make the difference for me).