Sometimes with Little League parents/coaches there is a fine line you need to walk with kids this young. I am not going to presume to tell you how you should or shouldn’t train you son. That is up to you. But, I do get a little quesy when I see parents putting radar guns on 9 year olds. Its a little much.
I will tell you that one reason that 8,9, or 10 year old superstars flame out by High School is for 2 reasons. One is overruse. The typical 9 year old stud ends up playing LL, LL allstars, AAU, Travel, etc etc etc. In addition, they get “encouraged” into playing and throwing year round. Parents and coaches tend to believe more is best and they are dead wrong. These kids end up in the care of an orthopedic surgeon by HS.
The second issue to be aware of is puberty. It is a great equalizer. Small kids get big, big kids become small. The 9 year old superstar is washed up 14. And the 9 year old dork who was afraid of the ball, is Johnny Heisman and gets the girls. Don’t take it too seriously, have fun, and spend some time with your kid. Everything else is gravy.