I know I'm being a Debbie Downer, but here's another angle:
Hendon Hooker in 2021: 7 wins
Clausen in 2001: 11 wins
Manning in 1996: 10 wins
Martin in 1998: 13 wins and a NC
Kelly in 1991: 9 wins
Ainge in 2006: 9 wins
Bray in 2012: 5 wins
Shuler in 1993: 10 wins
Dobbs in 2016: 9 wins
QBs are the only position judged both by their wins and how they affect W/L. I think we're a 5 win team without Hooker and a 9-10 win team with better (or at least more consistent) QB play.
Without Tillman, Hooker doesn't do much. Without basically ANY WR, Purdue's walk-on QB still absolutely trashed us. That's the difference IMO. Hooker himself is very inconsistent. He has a spectacular 1st Quarter, bad 2nd Quarter, usually a good couple of drives in the 3rd Quarter and his 4th Quarter is usually his worst. That's not good for a QB.