Couple of things...This right here is why KK isn't going back to college. If he wanted a college job, he would have made sure his name was circulated for USC, not OK. He's adapted to the West Coast lifestyle. He's not going back to a flyover state.
Secondly, those of you saying the college game is harder than NFL are obviously forgetting a few things and coaches. Look no further than The Old Ball Coach. He was shocked at how much more time the NFL game took away from his personal life...couldn't play golf daily, like he could at Florida. That's a big reason he bailed and went back to college (the other was obviously thinking Danny Weurfel could be successful in the NFL). These big name college coaches aren't on the daily grind for recruiting....they are only brought in as closers, when needed or if it's a super high 4/5 star recruit. In the NFL, you often hear stories of coaches like Gruden, Belichick, Dungy, etc basically living in their office...even sleeping there, because the pro game requires them to eat and sleep football 24/7.