I'm another firmly in the acceleration camp; I was only accelerated one year, but it was honestly a non-issue when I was in school. Just a curiousity that came up now and then. To listen to some, getting your drivers' license when you're a junior would scar you forever! (It won't.). In my mind, the risks of *not* accelerating are far more lasting.
I like Dottie's line--acknowledge that there are risks to acceleration, but that you as parents are willing to assume those risks. And that those risks seem lesser than leaving you DC in his current placement. You want him to "learn how to learn," which likely won't happen without some sort of acceleration.
