Really not sure where you get the QBR from? Because according to ESPN - his QBR is 68.1. Which is still plenty good as a freshman and puts him 40th. For example., Jayden Daniels has the highest QBR and his 95 something. So I don't think you're QBR number is accurate, FWIW.
In terms of Freshman he'd be 4th nationally behind Fifita (Arizona), Hoover (TCU), and Colandera (Virginia) in terms of QBR
Either way its a very impressive season. I am curious as to what he looks like moving forward as hopefully the offense expands and I kinda get the point about how it'll be a bigger test and the like, but that's true of everyone who returns on the team , its just QB is the obvious position where that is true.
And - IDK anything - but given the closeness of their age and also the modern times we are in, I seriously doubt Kohl is around much longer. Not that it really matters in the sense since clearly Rocco, unless he falls off the face of the planet so to speak, is QB1... but it would not surprise me if we have Rocco, Hughes and the new kid from SEP redshirting come fall as QB depth, Moberly, I believe.
Visit ESPN to view College Football Total QBR for the current and previous seasons
www.espn.com