From a talent perspective Nebraska's roster has 20 - 4* players, 63 - 3* players and a handful of lower rated players that are contributing. Plus, I think there is 8-10 of those 4* players that have been beaten out by 3* or their true freshmen. So, our team is mostly made up of 3* talent with a few 4* players sprinkled in.
OSU has 13 - 5* players, 47 - 4* players, 25 - 3* players and I'd venture to guess no walkon/lower rated players contributing (I didn't check that). So, basically 4-5* players with probably a few underrated 3* guys jumping in.
Illinois has 1 - 5* player, 11 - 4* players and 66 - 3* players plus probably a few walkon/lower rated guys sprinkled in.
We are recruiting at a higher level now and this should shift over time, but it is going to take 3-5 years. In 247's team composite score, we are ranked 24th and every team above and 2 after us have at least 1 - 5* player. We have zero. https://247sports.com/Season/2019-Football/CollegeTeamTalentComposite/
Coaching shouldn't get totally excused and they need to perform/develop better, but the talent gap is real between top 10 teams and Nebraska.
Good stuff.
You are a little off when looking at the 4* upperclassmen. Of the 8 4* upperclassmen only 3 (Raridon, Lee, Anderson) have been beaten out. The others (4) are Farniok, Darrion Daniels, Dismuke, and Jackson. The extra body is Jahkeem Green and he is new/likely redshirting.
12 of the 20 4* are underclassmen. 8 of those are freshman. Only 5 of the 12 underclassmen 4* are playing significant minutes at this point. (Martinez, Washington, Robinson, Jurgens, Tannor) The biggest short term impact should come from the defense. There is at least one 4* redshirting this year at every level of the defense.
If Frost can keep the wheels on then we should see some level of depth and consistency around year 4. All that's left to do is hurry up and wait.