And size.
One of the first things I noted when Nebraska joined the Big 10 was D-Line and LB play.
Big 10 teams were just more stout in the first two layers than the majority of the Big 12 was.
"3 yds and a cloud of dust" mentality.
That Mike Riley didn't have squats being mandatory in conditioning is where the Pelini 9/10 win seasons crashed and burned.
Yeah Riley had a 9 win team between the (6-7) and (4-8), but the wins were fairly close and not against anybody you'd expect to be stout up-front. I'm actually surprised they kept it as close as they did against Wiscy, but they got smashed like they should have against Ohio St, Iowa, and Tennessee.
It's that Riley 'culture' that Frost has been trying to flip in Lincoln. It takes time to wash that 'doing the bare minimums' out of a locker room because the upperclassmen are the one's with the voice. They are the 'leadership' setting the example if you can call it that.
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