Why it works: marking this right-or-wrong throws away the only interesting signal in the room. A team that gets the order nearly right and a team with a genuinely wrong model both score zero on a tick-box, and they need completely different conversations. Displacement separates them. And the number that matters is not the total — it is the one thing the room put far too high, which is almost always whatever is loud, recent, or personally annoying.
Make them commit out loud before the figures land. The argument is the activity.