Thank you Platypus101, puffin, blackcat and polarbear - great insights all around.
Yes, he is a social boy - at least one on one. He loves adults, younger kids and some peers. He's played on sports teams and will happily play sports. He doesn't like big crowds or noise and likely has sensory issues (that's a separate post).
He seems to need his book when he is in sensory overload as Platypus101 mentioned. As soon as I pick him up from school he buries his head in a book to relax from the school day. Same thing after a party.
I should also mention that hie is a single topic boy. He reads one subject exhaustively before moving on or deviating. Now it is sports. In the past it was history and geography.
I think he may have 2E issues but from what everyone here has said odd reading behavior is not in itself enough a problem.
