In those 30 years Pat has had 20 former players, assistant coaches, and a son who learned enough from her to become WCBB head coaches and win:
1) Coach of the year in three different major conferences ( PAC-10- Caldwell, ACC-Hatchel, SEC-Mitchell)
2) National Coach of the year (Hatchel twice)
3) National Champions (Hatchel & Peck)
It could be a simple as Holly just doesn't have what it takes & that is not Pat's fault.
As an early adopter in women's basketball, Pat got a jump on the opposition. She was a hard worker and that drive enabled her to become a legend. As often happens, legends become embellished as time goes on. Your examples of her developmental ability are a good example of this phenomenon.
You mention Tyler as an example. He may be a competent young man, but do you really think it was his ability that got him his coaching jobs? I'd opine that it was Pat's influence that opened the door for Tyler. How many other coaching hopefuls of Tyler's age are able to land jobs as did he? Besides, his record at Louisiana Tech is hardly earth shattering, not even as good as the The Lady Vols this year.
Regarding Caldwell whose record this year at LSU is 9-18. Enough said.
Attributing Hatchell's success to Pat is ludicrous. She had her own skills and perhaps didn't like what she saw at Tenn since she didn't stay long as Junior Varsity coach before moving on to coach at another school.
Regarding Mitchell, is it not possible that he developed his skills as assistant coach at Florida and Kentucky?
As to Holly's performance not being Pat's fault - Pat recommended Holly for the job. Who else should shoulder the blame? Perhaps if Pat used her vast influence to search for a true coaching talent, Tennessee wouldn't be in the mess they are now struggling with.