keep in mind that coaches are bound by NCAA rules and as a sophomore, they can't respond back to inquiries from your son yet, not until Sept 1 of junior year.
Just an fyi - I notice in looking at your posts that your son was a freshman in fall 2010.
Clock starts ticking the moment they are a freshman, and they have 4 years to complete high school,
whether you are at public, private or homeschooled ( online).
New regulation by the NCAA and they are sticklers for it
Your posts struck a chord with me, as my nephew was a 5 star too
and left his college tennis team as school ( pre-med) and tennis were too much....