Good Article, Joe.
This brought to mind the differences in those I've learned from - whether they were teaching me something at work, or if it was in school.
I know that I have learned more easily from some teachers than others. And after reading your article I can see that some part of my mind is reacting to the teacher as to how purposeful they are in their thinking. And the motivation I percieve is important as well... when I am in front of a teacher whose primary motivation is impress students with their knowledge, it makes it harder to learn - wrong goal... and even if they have some good info, it has to be picked out of the clutter.
I remember how often Branden would start off with a story from which he would then explain a principle, and then go on to apply it in practical terms. With him, I had a sense that what he was going to teach would be purposeful, goal directed, and well situated in its context. With your article in mind it is easy to see why those who think and teach with the greatest clarity are also the most purposeful and goal directed, and for a given subject, the easiest to follow.