I have never really taught him anything. On the other hand, I've been training him since he was born. So he doesn't know any stances, but he knows to drop his weight hard and fast after he grabs me. His feet will be in a stance when he catches his own drop, but he won't think about it. He won't memorize it or try to get it to look a certain way.
I've never taught him a hook, jab or even my beloved shotei. We play with things another martial artist might call ballistic and structured striking but they are general ways of movement, not refinements of a specific technique.
Sensitivity, power, movement. The next should be 'fighting to the goal' and that will lead into (worthy) goals and parameters, which are the roots of strategy. That will lead both into personal ethics and into analyzing potential problems. Then the game will become deciding what is appropriate on the fly and under stress.
He's not skilled in the way that most people are inclined to measure it. But he can be a handful, which I can't say about many people with, say, five years of formal training. He's a good kid. I'm curious what happens when and if he starts studying with a real martial arts instructor.