hello oops,
i posted a while ago on the primary board about my 'sensitive' ds (3), i was worried that he didn't have any friends in his nursery class, i was worried it was because he was 'different' from the other kids - but on the other hand i didn't want him to change... had lots of posts from people saying not to worry because things change so much at this age and in a year (or two) he may have loads of friends. Your ds sounds like he's a real bright spark by the way, congratulations!
I think the best thing we can do is to be as supportive and happy as we can at home, and not worry about them making friends. It helps if you have confidence in the teachers/staff - if he needs help, it's important that he can ask for it etc, and they don't just ignore him. But don't worry about friends - plenty of time for that!
in my case a lot of people reminded me that when ds moves up to reception there'll be a whole new crowd of kids and they'll all be making new friends and a new start then. So wait until at least Yr1 before worrying... (as long as he continues to be happy & enjoy books & learning of course)
Hope this helps in some small way? Indiemummy Xx