It's almost like we had a bunch more defensive talent in 09 and 10 and maybe the dichotomy had very little to do with Bo or coaching and maybe had something to do with a man named Suh. It's really more logical that maybe Bo is not the defensive genius some profess him to be. If that were even close to the truth, how in the hell did he manage to set so many defensive futility marks here? I'd listen to other explanations...... Did the defensive talent increase exponentially from '07 to '09?
IDK, did it decrease substantially from 2010 to 11...12...13...14?
Look, Bo had a system that would work in the Big 12 and one that would work with some NFL type talent on the team. So, he does know a little something about defense. But, his system did not fare so well in the B1G and it yielded some embarrassing results when people without the last name of Suh were on the field. These facts are not arguable, they happened, we watched them happen. So, was Bo the worst coach ever? No, he wasn't, but he sure as hell is long, long ways from the defensive genius some still profess he is/was. Defensive genius' don't give up all the rushing records Bo's defenses did. They don't fail to make adjustments. They don't own about 15 of the top 20 defensive futility records in Husker history. Sorry but when people try to still claim that he was some kind of defensive genius/guru, all I can do is laugh and question the intelligence of the person making such a claim.
I think the need for elite talent is over-played - everyone's system works better with better talent.
But I think you're on the right path with it working much better against the types of offenses we saw in the Big XII. Spread teams with not-very-mobile quarterbacks who didn't even try to run the ball very much. We didn't have to force them to be one-dimensional - the did that to themselves. And Bo's system always - even with the lesser talent the last few years - was among the tops in the nation in pass efficiency defense. Now you can argue that we didn't face as good of passing teams recently which is true but other teams were facing those same offenses and we were still better.
For whatever reason it/he couldn't/wouldn't adjust well enough to stop the run.