There is still a feeling in some circles that working your way up has merit. To jump by leaps and bounds is great for the individual, but for all the others that have worked hard in pursuit of something, what message does that send? Someone has to lose, in fact many have to lose for someone to win.
To say you either have it or you don't is quite a simplification. What is "it"? How is it measured? The same can be said about either someone can coach or they can't.
The scope of what has to be done goes up astronomically as more people come into play. A position coach is dealing with less people overall and a smaller part of the picture. A head coach is dealing to an extent with all of it, even if he delegates: he still has to have a good sense of what is happening in all areas and have confidence in it. That's where a competent staff comes into play. Who's hiring that staff, the head coach or the owner?
I don't doubt that Garrett has the capacity to learn, especially with his background. Against the big stage that is the Cowboys, the media scriutiny, the personalities involved, how will he fare? Is it fair given the expectations of the owner and the fan base to assume immediate success given the talent and its potential?
I agree that only Jones knows what he wants and will do what his money and ego dictate. We can't influence it, other than indirectly through ticket and merchandise sales. But we can argue things till the cows come home; that's the most entertaining part of message boards.