One of my judo coaches, a guy who is now... I think Bob is 55 now, has been consistently playing judo since he was 10. In school, he obtained a physical education masters. He's got an excellent job, every day he goes to the elementary school and teaches kindergarten to 2nd grade P.E.
Talk about a low-stress career. Anyway, he's one of the best judo seminar teaching clinicians I've ever been around.
I'm not at all surprised that you observed that, Jerry, as Bob was once, after a weekend seminar and a few of us were relaxing over beers and Mexican food, about how different areas of the brain are activated with different learning... methods. Watch a thing, occipital and frontal lobe; listen to a thing, frontal and temporal. Do a thing, and frontal and cerebellar centers firing.
Convert practice yourself into trying to explain a thing to someone else, and different areas of the frontal lobe are firing, as you are attempting to convert what you have thought and felt into words to explain, which leads to a different level of learning and understanding.
It's a really neat thing that pretty much anyone who has been asked this question, "How did you do that to me?" can answer... then feel. Sometimes it just flows out, sometimes there is a challenge as to how to phrase your concept of what just happened into words the other person can understand. Teaching is learning, too.
But, I'd be hesitant to go to a school, even though I personally started one by necessity as there was no other option if I wanted to continue to go to class, and learn only from a 1st Dan. But, as with my own experience, if that's the only option, due to location, or finances, it's WAY better than no training at all.