Public School, Full-time, autonomous Athletic Directors whose only oversight from the Principal is hiring and firing does not exist. Anyone that tells you differently is dreaming. Public school "Athletic Principals" also do not exist. They just happen to be the assistant principal that drew the shortest straw to deal with the parents who won't stop complaining. Those people usually do not get it completely resolved and the Principal usually has to deal with it.
In different states, the AD's are full time, good salaries, held accountable, autonomous, and with little oversight when it comes to hiring and firing. This will never happen in TN. Until then they will be nothing but glorified schedulers, and light turner offers and oners.
Privates fall into the trap of usually making the football coach the Ad and that is purely for a financial purpose to 1) give the coach a better compensation package, 2) keep them in their current positions. The other teams in most cases are the ones that get the short end of the deal. In certain cases, the other sports get no attention or very little support.
I do agree with the statements from earlier posts "someone that has never done it" and "someone that is not a head coach". Hard to get the attention of other head coaches in the building when you have never sat in that chair. By making an assistant coach an AD you have put them in a no-win situation and they have officially become the scheduler and utility man/woman.
Just my observations and by no means the gospel truth.