those were not the only teams we saw improvement at the beginning of the season.
the implication of your argument though is that the problem on defense is talent level. You believe we have the talent to take on bad teams while lacking the talent to compete with the big boys. I generally agree with you on that. but it’s still clear there has been regression because the defense couldn’t perform against Purdue.
The D also played well against N Ill who has the 93rd offense and even that is bolstered by playing some weak teams. I believe I remember early in the N Ill game a couple of long passes against the D that should have been big gains or even td's but their qb had a lousy touch. Probably every B1G qb we have faced would have completed those passes.
I'm not one who was impressed with playing a good half of D against Colorado. Games are 4 quarters, no credit for playing well in a couple of them. Besides Colorado is terrible. After scoring 34 on NU, CU has averaged 17 ppg in their last 8 games.
So count me in the category who thinks the D hasn't been very good all year. Though I take your point Purdue isn't great with all their injuries but still managed multiple 80+ yard drives. So yes, I think talent is subpar but other teams with similar talent don't seem to be consistently confused they way NU does, which I attribute to coaching.