So your only basis for him being a head coach is W/L? We should have jumped in hiring KF from Iowa after the 2015 season.
Also 9-7 is a better record than what Mike Riley had and we hired him. Also compare his Resume to the names listed above and then tell me how he isn't P5 ready, yet all those guys are. Also, how is 32 year old Lincoln Riley, the head coach of #3 OU, ready for P5 but Frost isn't.
Also how was Tom Osborne ever ready to coach the number 1 team in the country, yet he had zero head coaching experience? Pick any of the top guys who have coached in the last 20 years and when you look at their first P5 head coaching gig, let me know how someone thought they were ready, yet they wouldn't have passed your sniff test.
I don't think you're ready to judge whether a coach is ready to coach P5 football...
Edit:
Since your a numbers guy, I put together some for you
Scott Frost coach at UNI for 2 years. Their record while he was there: 24-4. Next 2 years they go 14-9
Scott Frost coached at Oregon for 7 years. Their record while he was there: 79-15. Next year they go 4-8
UNI was 7-4 the year before Frost showed up.
At the very least, he seems to have a knack for being part of successful programs. If Scott Frost refused to coach at Nebraska, that could be a bad sign.