Just because somebody is a successful coordinator doesn't mean he deserves a shot to be a head coach. Head coach is a completely different job with a different set of job responsibilities.
You have to be a leader above all else. You have to be the face of the franchise. You have to have a plan on how the team will all row in the same direction. You have to demonstrate that people want to follow you.
Just because you're a smart coordinator with a good record doesn't mean you have head coaching skills. I also think that a good owner and GM can figure out whether or not a candidate has HC skills, and not just through the interview but also by talking to people who worked with the guy.
Joe Judge gave the impression that he could do all those things, but he couldn't. Hackett, I'm not sure if the Broncos looked for all the right traits or if they just hired a guy with a good track record as an OC. Brian Daboll gave all of the signs that he had HC skills, and so far, so good. Wink Martindale is a great DC, but he can't get a HC job because he doesn't give teams the belief that he could be a successful head coach.
Mike McDaniel had exactly one season as the San Francisco OC before getting the HC job in Miami. He didn't get that job based on his great record as an OC. He got that job because he gave the impression that he possesses HC skills. And in his case, it sure looks like he does.
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