Sure, it could be that.
It could also be institutional investment towards football. Based on NCAA data, the latest year of expenses* (2016/2107 season) has the following:
Clemson $44M
Bama $62M
Ohio State $38M
ND $33M
I think this is where some of the largest gaps occur. Sure, Saban and Dabo are great coaches. But the resources the institution pumps into the programs are far greater than what other schools do. IMO, this is the crux of the problem. If people were serious about trying to create a level playing field, there should be a program spending cap (versus a salary cap in NFL).
https://ope.ed.gov/athletics/#/ Data can be found here.
* All expenses attributable to intercollegiate athletic activities. This includes appearance guarantees and options, athletically related student aid, contract services, equipment, fundraising activities, operating expenses, promotional activities, recruiting expenses, salaries and benefits, supplies, travel, and any other expenses attributable to intercollegiate athletic activities.