The reason so many publications have already put Nebraska in their Top 25 for next year is because this team was significantly better than 4-8 last year. Where Northwestern shouldn’t have won as many as they did, Nebraska shouldn’t have lost as many as they did. By pythagorean win expectation, which is a measure of how many wins a team should have expected based solely on points scored and points allowed, both Nebraska and Northwestern were about 2 games off (6 and 7 wins, respectively). Furthermore, Nebraska did a rather poor job converting yardage to points, so it’s a little more of a shift than even that would suggest. That’s also considering the full season’s stats, not just the last half. If we consider only the back half, Nebraska is about an 8 win team.
When you consider an average second year coach improves by about 2 games, and top coaches quite a bit more, a more favorable schedule, a returning QB, and back to back quality recruiting classes, it’s not as illogical a jump as it sounds to go from 4 to 10. I’m not saying it will happen, I need to get a better idea of what the defense will be before I did that, but this is a rationale for why both local and national people have big expectations for Nebraska next year.