If I was asked to succinctly describe the boy right now, I’d say that he knows everything.
I always expected him to get to this stage, but it can get to be a bit much dealing with an 8-year-old know-it-all. He becomes darn near insufferable, especially when he resorts to extreme pedantry to be right. It’s like he has to be right.
It also makes some of the worst moments when he actually is right. It makes him that much more difficult for the next time. And right now, there is always a next time.