The offense blew it. Our D was designed to make teams sustain drives, our Offense had to be able to score points at times to win games. The fact that the offense could not do this when necessary led to the offseason O staff changes.
Giving up 23 points including 7 on that 31 yard TD drive to an offense as good as Oklahoma's is no shameful thing when the Offense essentially assumed the fetal position after the first quarter. And they STILL had a chance to win it late. How about that halfback pass to Martinez? what a really great call. Or how many of you were screaming REX+WILDCAT in the 4th quarter?
Watson and the O staff shoulders the lion's share of the blame (read: 99%) for every single loss the last 2 seasons, not the D. That's why the coaches of the under-performers are gone(offense-scoring-points/receiver production much?). If you disagree, I'm sorry, but you just don't know jack about football.
Also: Notice how the changes on the D staff were not due to "lack of performance", but rather to fill positions of departing coaches.
Any astute observer of the last 3 NU football seasons understands that the offense has not been holding up it's HALF of the deal, and increasingly so each season(not to beat that horse any more, but really...).