You are the one claiming there is a mathematical advantage to being down 9 vs 8 because you "know you need two scores". So you explain how you come to that math, how a team can just magically score faster if it just knows it needs to scores twice, instead of hoping they only need one score, but playing as if they need 2 scores.
I'm not saying it's better to be down 9 than 8. My god what's wrong with you. I'm saying you are better off knowing early whether you are down 9 points or 7 points.