Because most assistants in today's game aren't at the same school for more than a few years unless they're promoted. Also, besides a handful of schools, no HC is guaranteed to be there 3 or 4 years anymore. Its not like the 90s where Fulmer had staff members here for 10 years. The school is the only guarantee that will still be here.
I'd fare to say our next staff would have someone who has had some sort of relationship or at least familiarity with Henry T from the recruiting process as highly touted as he was. Coaching jobs are a revolving door. If you want to blame anyone for this its Pruitt for being a trash head coach and the admin for letting this thing drag on as long as it has. I dont blame him for looking somewhere else. I would as well.