Renee, no it isn't offensive. I think a lot of people agree with you (including me). I just don't understand the rush, quite frankly.

If anything, I would be inclined to hold William back a year before even putting him in school to make sure he is ready for it. I don't know too much at this point about his abilities (obviously) but I have heard that boys sometimes need a bit more time to mature. Better to be held back in starting than to be held back later as others have said.