Well, you can do some research yourself to start things off...maybe you already have?
Miraca Gross' book
Exceptionally Gifted Children comes to mind.
What about an "I know you want to help, so let's work together and figure this thing out" approach. You show them some studies you've found supporting acceleration and showing (as in the Gross study) that not accelerating is usually not a good option in these situations.
Emphasize that doing nothing is a choice for the status quo. It is not a "safe" option and it is currently not a viable option. Doing nothing because one grade skip may not be enough down the road doesn't really make sense. You need to find an appropriate placement now for your son's current needs. His future needs will be assessed and addressed in the future.
I don't think they can fault you for being a concerned, involved parent. Isn't what they're always saying they want? For parents to value education?
Later on, (if/when Davidson comes into play), they will be able to back up what you've been saying all along. Won't that increase your credibility?
