If Garrett's team "development" was at all successful, we wouldn't have back to back 8-8 seasons given our level of talent. We are not much better than we were 2 years ago when Jason took over. We have improved our canned pressers and our guys are more outwardly courteous in public forums, but the team is still an undisciplined and sloppy mess IMO.
I doubt Garrett could get anything other than a QB assistant gig at this point, which speaks volumes about his suitability for being HC of the Cowboys. If Jason is serious about learning the position, he should seek out a HC or OC opportunity at a small DIV I program, he's been paid a ridiculous fortune to learn on the job in Dallas, it's time that he banks the proceeds from Jerry's mistake and steps back and learns in an environment where the game is a little slower and easier to understand.