If quality "coaching" were worth so much as you claim it does:
And the alleged "quality coach" has that Team from M-F to practice them, develop them, and come up with strategy for GameDays, then how does MTSU happen, then how does 2015 happen?
The Coaching is THE ONLY VARIABLE that never changes
Coaches just don't get dumber over time with more experience, what does happen is they lose TALENTED PLAYERS due to injury or other reasons
The only variable that constantly changes is THE PLAYERS, injuries change who Plays, and Graduation & leaving to pursue the NFL changes who Plays
Was there any difference in Boss Ross in his first 2 years vs. in his MNC year; sure there was, THE PLAYERS got better, more experienced, and they were able to execute Ross's "10% contribution" to the Max and that's what led to that MNC Season
Les Miles won a MNC at LSU and was nipping at Saban's heels, if "coaching" were really worth more than 10% like you claim, shouldn't he be able to make Kansas a consistent 8-4 Team in a much easier Big12, despite the lesser Talent on the Team?
I trust Urban Meyer when he said "Recrootin' is 80% responsible for a Coach's Success" (wins & losses), I'll let you fill in the Blanks ---- you tell me how much is leftover for Player Development, and how much is leftover for Game Day "Coaching"?