OK speedbump28, the thing is though:
1) You've recognized that his adjusted defense (actually you might still be stuck on PPG, but whatever) is ranked 181st. That's top 3rd in the country, not great, but not a game killer, even UCLA is over 100. What you haven't backed up is just assuming that moving to the Big 10 will result in him having even worse of a defense. He'll have better athletes at Illinois, why can't I just assume he'll have a much better defense? Or at least on par with Michigan who's at 135.
2) Here you're right, he hasn't coached at a higher level. He hasn't had the chance too, and he will almost 100% be coaching at a higher level next year. All legendary coaches start somewhere. We have a coach opening this offseason, not 3 years from now where Keatts has proved himself up to your arbitrary level. Oh and by the way, according to Kenpom, his rag tag group of JV dummies would be the highest ranked team in the Mountain West, 2nd in the C-USA, and (i don't want to look up the rest, i assume 3rd in the MVC and WCC and lower in the AAC). And that's with CAA talent, which as you've discussed, wouldn't be fit to clean the Hickory HS's shoes