I get what you are saying but in Pelini's defense when he had people running his defense the way he wanted, it was very good despite its complexities.If you're a coach, then you're a teacher. You'd better be able to teach. To say Pelini's defense was "very good" despite it's complexities is probably true, if he got 11 guys to execute it consistently, it probably would be brilliant. 2009 showed that. Ndamukong Suh makes a lot of defenses look pretty good though. Same could be said for LaVonte David when he came into the picture.
The point is though, as great as Bo Pelini's defense is -or that image of what he wanted them to be that was trapped inside his head - it all meant nothing. Zip. Zero. Garbage. None of it matters if you can't teach your players to execute it. As we saw, they rarely did execute it and Bo told us as much on a weekly basis. So what kind of idiot watches his team not execute week after week, yet changes nothing? Stay the course Bo.....good for you, look what it got ya.
This new staff are teachers first. These guys are real coaches. They realize these players aren't pons on a chess board. This is football.
I'd only question the term "idiot" and maybe suggest "stubborn . . . something or other". And add, that the same could be said for using the same signal for the snap that the defense was reading.