Hi Lori H,
I say - 5 good friends! That's wonderful! Let him slide on the agemates for now. You may want to insist that he spend some 'service' time helping younger children as a way to build character, but I can't see what good it will be to force in into agemate interactions.

DS11 also votes for 'let him be.'

I wish I had a lead on where to correspond with other 2E kids - have you explored Hoagiesgifted.org?

Smiles,
Grinity

Coaching available, at SchoolSuccessSolutions.com