I think the nice thing about skipping is that at least for a year, the rate of learning is faster because the child has to catch up a little.
The potential trouble with HG+ kids is that skipping one year is not always enough. Some need two or three or more over time to stay challenged. That's perfectly fine for some kids, but can be harder for other kids, especially socially. So having true peers makes all the difference in the world!
Personally, I'd think long and hard about breaking up a peer group of 4 kids who "fit" neatly. If they're all on equal footing and one of the four is skipping a grade, I'd certainly at least be thinking about skipping mine, too. And I'd probably be talking to the other two sets of parents, too!
