No. 1 against No. 2. And even that seems awfully high when you consider what these two defenses have accomplished. TCU allowed only an average of 9.6 points per game. USM gave up just 16.5 per game.
Every defense is supposed to have at least one bad game.
USM's had a couple. TCU's never did. All 11 opponents on the Horned Frogs' schedule had their lowest offensive output of the season when TCU was the foe. TCU recorded two shutouts and held two more foes to only a field goal. Only two opponents scored more than 14 points against the Frogs.