Going back to the late 60's we've hired three assistant coaches to be the head coach at Arizona. Bob Weber, Jim Young, and Mike Stoops. You can argue that Stoops had to dig out from the Mackovic disaster, and he got us to three bowl games, but the collapse in his final year was on the foundation he'd built. Maybe with more money for assistants, it would have been different, but he tended to drive them away. So, the only successful coach of those with no head coaching experience was Jim Young, although he was only here for four years, and it was the WAC, not the Pac-12. I don't care how "can't miss" somebody is labeled as the top assistant in the country or what booster wants to push for him. From now on, an absolute pre-requisite for the job has to be that you have successful experience at a pretty major BCS school. Doesn't have to be a P5 team, although that would be nice. If not, you need to be winning big and knocking off a number of decent P5 schools. We'll see how Kirby Smart does at Georgia. I'm not sure how often a coordinator is really the brains of the outfit, or how much they're just good at keeping the machine in their shop running well. When you have to hire a staff, emulate and build entire systems on offense, defense, and kicking, do public relations (including damage control) in the community, be the top recruiter, deal with player behavioral problems, and be ultimately responsible for the whole thing, that's a little different than just recruiting defensive players, coaching technique, and dialing up a game plan 13 times a year. The tool kits are not necessarily identical.