I am not sure what he has done to get an A or a B. He coached a MAC team that was set up by Coach Novak, with Coach Novak's players to a decent enough record, but he never beat anyone of consequence. You are probably sick of seeing the fact that he was 2-12 against winning teams, but it is a fact. So despite what is being claimed, he did not build two programs. He built one 1AA program in southern Illinois. Not saying he is a bad coach, not a Brewster, but certainly I don't see him as guy who is set to displace Bear Bryant on the list of all time coaching greats. But with all the gushing going on in this board in the last 24 hours, you would think that Ohio State should just concede the conference to Kill & company right now. He has gone to one MAC championship game and some meaningless bowl games. Ho hum.
The real reason for the low grade is that I don't think he has done enough to be the "wow" coach that Minnesota needs right now. I live down here in SEC country. The coaches here are larger than life type guys who command the media and can instantly get the attention of any recruit. A lot of the Big Ten, Big 12, Pac 10 and ACC coaches have the same star quality. Coach Kill may be a great, down home guy, but he does not have the star quality that will draw the high level recruit needed to compete in this conference. He does not project an image of being a powerful leader. If you are honest, you would have to say his appearance and personality will not turn the heads of any elite high school footballer. Good enough for the MAC maybe, although we don't know that because he left UNI before he would be playing mostly with his guys, but just not ready for the prime time. All the guys you mention as alternatives all have way more star quality than our new coach. They all, for the most part have more experience in big time programs.
I think we are in for an extended period of mediocrity and that did not have to be.