What about t-ball instead. it might be a little easier. I'm not sure. Soccer seems like it would be difficult for him. My brother hated sports as a kid because he wasn't as coordinated as most of the kids.

I think helping him develop the 1-1 friendships is a great idea. I'm not sure what you do when he is in group situations.

Do you have a special olympics group near you? maybe you could find him a soccer team through that or another sport he is interested in.

big hugs,