@Giff, I'm going to agree and disagree with @adbono. Yes, you do choose a service academy because you have a desire to serve your country. What a great way to serve AND play D1 baseball! The same can be said of players who choose an Ivy school (or any other high academic school). You make this choice because you want the very best education (and take that with a grain of salt--you attend for the connections) and an opportunity to play the sport you love (and serve your country in the case of a service academy--not to mention college paid for by Uncle Sam). You use baseball to get what you want. There is nothing wrong with this. Take the draft that just completed. Almost all of these players will be out of baseball in the next 2-8 years. Then where will they be? Their choice was to play baseball and have an opportunity to play at the highest level. It wasn't to get the best education or serve their country. There is nothing wrong with this either; they freely made that choice.
Sure, perhaps your son is ranked too highly... But give some credit to PG, they've been doing this for while. Everyone pays the same fee to get a grade so there's no incentive to rank or grade a player too highly. Why pay more showcase $$ if you already got a 10 grade and a top 100 ranking?
And your son's 9.5 grade? Given by "non-baseball people that pretend to be knowledgeable?" I guess we would have to say the same for the MLB scouts that reached out to your son. What do they know?
Your son's grade seems to be correct. PG has been doing this for a long time. Just go back and look at prior years rankings and see how many of the top 100 were drafted. Most of them... Metrics don't lie. You can't teach metrics. Many parents on this site get worked up because their son hits or pitches like nobody else but because they don't have the necessary metrics (arm strength, exit velocity, speed, size, etc.) they get overlooked. Because these are the things that scouts notice. They may not be able to help a college coach win the championship but those coaches will sure roll the dice to see if it works out! MLB is no different!
Just tell you son to keep grinding; he'll get there. Tell him to go where he wants to go and use baseball to get there.
But.... Also have him work on arm strength. As I said, metrics don't lie--this is what he lacks. His pop time will increase along with an increase in velocity.