Thanks for posting this.
For the younger high school guys, this is a guy who is looking (I am sure) to either move on to a big college (D1) or get drafted at some point.
Notice the movement on his pitches and the velocity. He does not need to be obsessively nagged to "live at the knees" because his stuff is good enough to elevate some. He can get away with more because his stuff is good.
I am sure 5 MPH velocity in addition to what he has now would change his baseball prospects quite a bit....not being critical, I like how you pitch, just trying to give a little heads up to the younger guys. Let the lesson be....78 is not the same as 84....84 is not the same as 89 and so on....88 straight down the pipe belt high will get hammered by D1 hitters.
So, to the younger guys, watch this video and see what a guy who is a D1 kind of recruit looks like. Where is you velocity? How is the movement on your pitches? How is your conditioning and strength? How hard do you work?