I feel your confusion...
I was sure DS7 was MG. Maybe more than that in the nonverbal domain. And I thought that must be about DHs ballpark as well, and mine in the verbal domain. Now it turns out that my goofy, anxious little boy, who taught himself to read at five and mostly has his head in the clouds, has a FSIQ of 154.
I am reassessing my own childhood, reassessing my two younger kids, reassessing kids I know who struck me as the "not that bright" variety...
You just can't tell from the outside. It makes me wonder what is yet to come.