Nobody is intelligently saying that a coordinator can't do it. And nobody is saying that previous head coaching experience is an absolute indicator of future success.
But when you talk about the odds of something happening, it drastically changes the conversation. It's pretty ridiculous to think otherwise.
Well put. I've said the same thing in other threads too. There are exceptions to every rule, but if you are looking at probabilities, an experienced head coach with success has a better chance of succeeding here than an experienced coordinator would. Plus, unlike some assistants that are promoted within their current program and who are able to retain the team chemistry and style of play, we are talking about an assistant coming in to build a whole new approach to offense, defense, special teams while trying to build team chemistry and trying to convince prospects to choose Nebraska over its competitors.