Let's see ...
2021 class, four 4-stars
2020 class, six remaining 4-stars (four left)
2019 class, four remain (three left)
2018 class, three remain (three left)
EDIT: I missed counting three four-stars that have transferred to Nebraska during this time frame.
The 2005 class (Callahan) was loaded -- ranked 8th nationally with one 5-star and 8 four-stars, including Zach Potter, Zach Bowman, Lucky, Suh, and Dillard (and others that developed into NFL players, such as Matt Slausen, Barry Turner, and Steve Octavien). 2006 class had five 4-stars, including Purify and Carl Nicks. 2007 class had six 4-stars, including Asante and Niles Paul (and non-4 star studs like Prince Amukamura, Crick, Helu).
Callahan couldn't coach (especially with Cosgrove's failures), but there was no doubt talent, which Bo inherited and did well with between 2008 and 2010.
I'm not questioning the recruiting sites' rankings. I'm questioning that we have more talent on our team now than at any point this century, which is what you said.
Regardless, we definitely have talent on our current team -- as I've also said. More talent than any other Big Ten West team for all of Frost's years -- at least based on recruiting rankings. That's not the problem -- and there obviously have been problems. My initial debate in this thread is the underdevelopment of talent under Frost -- at least thus far. We'll see in 2021.