So Osborne had 25 superior line classes in a row? I'll agree that once the defense came around we were the most dominate team in college football but for 20 years Osborne managed to win at least 9 games a year with a very average defense. If you are trying to tell me that teams now days can't do that Guy are 100% dead wrong. Go back and watch Baylors last 2 games from last season.
If you go by All-Conference, All-Americans and Lombardi and Outland Award winners than yeah, Osborne had a pretty good run with dominating offensive lines. It also showed in their dominating run offense, which was not achieved simply by running the ball a lot, but by recruiting specifically for a rushing offense. Nebraska was a destination for offensive linemen. But it hardly happened overnight. Really not sure what you're disagreeing with here.
And "average defense?" Don't know about that, either. Nebraska's defense made a huge difference during our 40 year run of excellence. I'm not sure what teams you are choosing to remember, but great Nebraska defenses gave up only 8.0 points a game while the lesser Nebraska defenses still gave up only 14 points a game. Compare that to the 26+ ppg Nebraska defenses have given up in recent years and you can appreciate the difference that makes in the offense you run and the games you don't win.