I agree with notnafnaf; he doesn't need kindy for social skills and depending on his temperament, it may be a detractor. My DS is a very social child and would pick being with friends over an intellectual challenge because he knows he can learn stuff at home. He loves school and the interaction with the other kids but he was going anyway as I am a single working parent.
Kindergarten is for teaching how to sit on the rug in a circle, queue, be nice to others, and raise your hand. It's really less about academics and learning than it is about teaching conformance to the classroom rules. If you play school with him at home, you can teach him all of that and still challenge him intellectually.
