Seem from US before...or never saw at all?
We did have some interesting schemes on D...playing with 1 D-Lineman many times...a whole army of LBs lined up, standing up, off the line and ready to ambush Romo. Landry played a DE-looking position sometimes. CB blitzes where the safeties both rotate to the blitzing CB's assignment...who Romo may think is open because the CB blitzed.
Haslett looks like a genius.
I swear I saw a 1-8-2 or 1-7-3 scheme a few times.