To break the Sexton lock, then it needs to be proven that head coach pedigree and/or experience aren't as responsible for success as some believe.
Load data in a spreadsheet with data such as coaches name, program, early W-L records to recent W-L records, longevity at a program, longevity as HC, program size, resources, conference, records without said coach, etc. Then run some correlation analysis.
In that way, we can see things like former OSU assistant Luke Fickell's achievements at OSU, UC, and UWM. Likewise for Ryan Day, Chip Kelly, Steve Sarkisian, Dabo Sweeney, Lane Kiffin, etc. Is it the person, program, position, resources, conference, etc.
I read a journal article looking into whether Harvard MBAs make more effective CEOs. Controls were company size, industry, previous stakeholder value, pertinent CEO background info, and so forth. The methodology was pretty clean. The findings were that an MBA, or one from Harvard, had little to no effect on company performance.
Maybe Terry, with some tweaks to program structure and personnel, could show that much of a coach's success is related to environmental factors.