I guess John must still be at work. Otherwise he'd be reading all this incredible advise! Wow! kudos to all you guys/gals for loading him up!
I might add this:
John, you've read many suggestions above about being a great supporter of your son and his JV team should that be where he plays this spring. What does "supporter" really mean?
I'll tell you what it doesn't mean. It doesn't mean that you sit around and talk about how better your son is than so and so. It doesn't mean you begin discussions with other parents about lack of playing time. It doesn't mean you take note and let everyone know when other's make errors or are in a batting slump. It doesn't mean you talk about the coaches because they "don't know talent if it bit them". Are you getting the drift?
I've seen these kind of Dads and Moms when my son was in high school and they were the "cancer" no one wanted to be around. They were exactly why I took my chair and cigar up to the right field hill and sat by myself and enjoyed the peace and quite.
Your son sounds amazingly talented. Like TR said, you'd be amazed at how much the coaches already know about your son. If they don't, let them find out for themselves. I'm sure it would be refreshing for them to see great talent now and/or later.
I can't emphasize enough, enjoy these last 4yrs. It goes by incredibly too fast and then you'll be looking around asking where did they go?!
Good luck.
YGD