The private school factor is definitely somewhat unique to Tennessee vs other states in which I have lived. Also, the density of high schools is somewhat less.
Take Williamson County- in many other states, there would only be 3-4 high schools splitting up player/coaching talent along with maybe 1 private school. However, Williamson Co has 7-8 high schools along with about 7-8 private schools (many in Davidson Co, but close by) pulling against the player/coaching talent pool.
Would like to see how well Brentwood High or Franklin High would be if there were no BA, Ensworth, MBA, CPA, et all or the other smaller high schools. I love our private school system- but I would put that team against anyone/anywhere.