My DS was nominally enrolled as a K but spent the entire day pulled out for different grades/subjects. Every kid is different in eaht they can handle, how they adjust. My concern would be how your DS will handle all of that structure? If he's never been to any sort of group setting, it may be hard in the beginning. In K they expect kids to have trouble staying in their seats etc...
This is why I think a 1st skip would have worked better over a K skip for my DS. The kindergarten teacher expected kids to be high energy and coming from many different places. I will say our kindergarten teacher who was wonderful (considering he had 24 kindergarteners, 14 being boys) had only 2-3 years experience. Our not-so-great 1st grade teacher had closer to 20 years. Her expectations of 1st graders was very rigid. She didn't approach the kids as individuals IMO. YMMV of course!
