Each of those programs except Northwestern has a higher AVG score than Illinois does right now. Also, in the transfer portal era you aren't going to see the massive 30 high school recruit classes anymore. Everyone is hunting for quality because they know the transfer portal will smooth out any consistent recruiting misfires (or roster development failures).
And Illinois/BB continue to improve the program and the recruiting. I don't ask for anything more. They are getting quality players and will do well in the B1G.