Then the wheels fell off. A lot of pressure on this defense, when the offense goes 3 and out in a matter of seconds over and over again, especially with depth issues.
Same scenario against Ohio State. Defense looked good for a quarter, maybe a little longer, but realistically if they're always on the field eventually bad things start to happen.
This is not to absolve the defense from poor play. They simply could not stop the run yesterday for more than the first 5-6 minutes and it's the most humiliating way to lose.