I was just reading Richard Kim and he said that a sensei must often feel like a person yodeling in a mountain valley. He hears lots of echoes but wonders if anyone hears him.
I understood him to mean that lots of people repeat what the sensei says, but they usually don't have any idea what he was talking about.
Pictures or graphs of the outside of the sensei's body will not and cannot help us understand. We can be right with the master and copy all of his movements. To understand the internal, we can only take his descriptions and experiment endlessly with them.
I will say it doesn't hurt to see videos of the teacher (especially if you understand that the outer form is only a shadow of what happens inside) and getting close to a big teacher is excellent, too.
But the only real answer is to get with someone who knows, feel what they do and follow their advice on how to develop.
That makes some sense, but again, the external form is only incidental. In this case, form follows function. If you pay enough attention to gravity (weight) in the form, you can start to get somewhere.
Not to pop your balloon, but I just don't think it's an effective approach and will more likely just distract from real learning in your body and with your mind.
I think we are in agreement. A conventional picture will never be able to describe the how and why of a smiling face captured within it. Biometric data is (are?) no different.
As to my distraction, I probably would have just wasted the time anyway.
Incidentally, I'm not talking about copying (someone else) but comparing self-to-self (at a later time).