How's that?
In a metro area of over 3 million you're going to be able to find at least 30 kids who can run incredibly fast and/or are at least 6'5" 290 lbs.
If you're in say, Chaffee, New Madrid, or Scott City, where the largest population center is 2,500 people and of that half are kids, the odds of having one, much less 30 of thosegenetic marvel go down significantly.
In that scenario it doesn't matter if Bill Walsh is your head coach, if your biggest kid is 6'2" 230 and your fastest kid runs a 4.8 40, no amount of coaching will make them a D-1 kid.