I tend to agree with you about the quality of Illinois' depth this year but honestly think this shouldn't really be argued about, mostly because it's statistically irrelevant for elite teams. The roster as it stands is a top-10 team at worst, likely a top-5 team, and potentially a top-3 team. In all reality, having a lot of depth or utilizing your deep bench (9th+, etc.) as a core part of your scheme doesn't have anything to do with Championship basketball, at least according to data from the last 5 seasons.
I got a bit of time to take a look at this statistically, and depth (for which I'll use bench usage) has a weak-to-negative correlation with a team's success.
If you look at the top ten teams from each year's bench usage, each year it's less than the bench usage for all teams in D-1. Most elite teams float around the 200-250 rank, and the table below shows the difference between top-10 teams and all teams in terms of % bench usage.
View attachment 51037
Further, you'll find the same correlation between the top 10 overall programs (average KP rank over the past 5 years) vs their bench usage over the past 5 years. The Pearson correlation between overall rank and bench usage is r=0.165 (happy to share the data set if anyone is interested in digging into it more).
View attachment 51039
We have awesome bench pieces for what we need them for, no matter how good any of the Freshmen are. If they're really good, we have a great problem, if most aren't B1G caliber, also great, because we have a elite-level top 7 or 8 already, which statistics show is what you need to win a championship (not 9 or 10). I hope this helps end this one, because at the end of the day, we're an Underwood-level team having Groce-level arguments.