My son has a similar situation.My son does everything ClevelandDad mentioned too,but we have a different outlook.We let the cards fall where they may for high school.For my son,this is the first time he will be playing with a lot of these kids and this an opportunity for him to go out and have fun,play hard and work hard to stay a leader on the field.Just because he won't be on varsity this year will not make or break him.(no freshman at our hs is allowed to make varsity,too many kids as it is!)That is not what will define him as a player.My son has always played up (18u)and this will be a time for him to shine.Think of it as a lot of play time vs. a lot of sitting time.I think most parents think their child is better than the rest of players, and they might be, but there are a lot of other factors to consider,maturity,mental strength,leadership,power...stuff that does get even better with age.
If your son,like mine plays alot of high calibur travel tournaments,plays up and or attends college camps and makes an impression,thats where,in my opinion they can or will really get noticed.(PS. we also sit away,keep away and button our lips at all times for high school,except for fundraisers)