George, you have brought to mind something that happened many many years ago when I was a young no rank.
The very first time I saw Saotomi sensei I was alone in an aikido club office in a school gymnasium when sensei appeared in full mountain man garb. Not wanting to get in his way I mumbled something and left him so he could have some privacy. A few minutes later after bowing in sensei gave a pointed lecture on how greeting another person, matching their intensity and presence was the entire basis of the uke nage relationship and budo itself.
Now I'm sure no one understood why sensei decided to address this topic because no one else had been present when he arrived, but I knew exactly what he was talking about and have remembered it all these years later.
So sometimes there is an audience of one. Or perhaps, it is always an audience of one.
The lessons from a great teacher can go beyond anything technical and they can come when you least expect it. I say this in both a positive and negative way. Since our teachers are flawed human beings, like all of us, the lessons can be about what you want to emulate and what you do not. The trick is to always be paying attention so you get the lesson when it appears. Then you choose what to do with it. Great to hear from you...