If you look at my post earlier in the thread, Tennessee has on average pulled a top 15 class yearly since 2007. Their worst class was 33 back in 2008, and they've pulled as high as a #4 class in that time. They've consistently underperformed their recruiting ranking until hiring Heupel, who runs a modified high school scheme offense.
So, with every coach except one since 2007, Tennessee has significantly underperformed their recruiting ranking under multiple coaches, including one who won a national title. Heupel, with a scheme offense, is the only coach that has overperformed vs his recruiting ranking.
This year, with a scheme offense, is the first time Tennessee has beaten Alabama since 2006.
It's one piece of evidence, but it's strong evidence that we overrate recruiting and we underrate scheme.