The Bo Pelini conundrum is pretty simple. Instead of cutting his teeth at an FCS school and or lower tier FBS school as a head coach, he was handed the reigns of an old school power team that has high expectations that equal current day SEC teams with almost none of the same advantages. I firmly believe that had he gained meaningful experience elsewhere first, his tenure here would have been different.
Can't make that conclusion myself. Bo Pelini had damn good tutors in the NFL - The San Francisco 49ers, The New England Patriots and the Green Bay Packers. He had DC experience at Nebraska, Oklahoma and LSU. He knew how the game was played -- and coached -- at the highest levels and with the highest expectations before accepting Nebraska's HC job. Coordinators make the leap to Head Coach all the time, including the NFL. Coaches who don't have a Head Coach personality and ambition don't apply for the jobs.
Bo embraced the new power being a Head Coach gets you. Really embraced it. Hired his brother and surrounded himself with a staff that wouldn't threaten his authority. He had at least three years of meaningful experience and on-the-job training, at which point he could have embraced his experience and made a few adjustments. That would have required admitting mistakes -- something grown men know how to do -- but Bo didn't do that. He dug in his heels and taught his team how to defer responsibility. He revealed himself to be a thin-skinned prick in 2003, in 2011 and on the way out the door in 2014. The "new Bo" was still behaving like an angry clown. Experience taught him nothing.
Those are character traits. They're gonna pop up anywhere.