Why can't a 16 year old be an effective coach? Who knows? I am certain my son could teach younger kids to pitch better than a lot of coaches out there.
I do just want to put one thing out there. I live in Texas. If my HS son gives lessons, helps someone out with baseball or similar and gets paid for it, it is a UIL violation and if you play on a high school team all of the games can (and most likely will) be forfeited.
It happened here a couple years ago. https://usatodayhss.com/2016/n...ted-amateurism-rules