I think the issue is more about development. That includes maturity. Perry and Williams were highly rated out of high school. Both had showed signs of ability, but also have had their faults including lack of maturity. Kaaya was a very good QB. He holds the passing records at UM. I think he would have been all ACC 1st or 2nd team his senior year had he returned.
I think too much of the blame has been placed on the QBs. I believe it has been a combination of many things including the offense itself. The biggest issue to me has been the offensive line play. Pass blocking was terrible which affected QB accuracy and completion %. We relied heavily on the passing game which did not suit us given the porous pass blocking. Better line play would provide a better running game that benefits the QB. We were atrocious in the running game last year. We were near the bottom in nearly all rushing statistics among all D-1 schools:
Rush Play % 44.95% (#112)
Yards/Rush 3.5 (#119)
Rushes/Game 30.8 (#117)
Rush Yards/Game 106.7 (#122)
These kind of numbers put too much pressure on the QB to make plays against a defense that knows you can't run the ball and can't pass block either.
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