IMHO, there's too much worry or concern on velocity for a 14 yr old, CACO or other "2020's" The more important focus would be mechanics & injury prevention. Like I said, & will maintain, HSbaseballweb was started for HS'ers heading to college or the draft. As time passed (abt 6-8 years), the site grew & grew to include a broader audience, all with the view to prepping for scholarship or for a very lucky few, draft eligibility. And, if you'd spend a little time in Pre-HS forum, you'd find some gems from longtime or original site posters like fungo, piaa, TRHit, Redbird05, PG Staff, etc...on the subjects you reference above...and more!! And, things that may yet have come up!
So...there's really not any NEW revelation...just posters that have grown with their boys...With STILL lots of excellent advice, personal experience, insight.
And, I agree with those who advise to not put pressure on kids...particularly the 13-14 yr old youngsters...These kids are growing, blooming... or wilting... so quickly...it still needs to be fun for them! They are transitioning...
Again, no need for a separate "group"...