Hi Ron, yes you added some good points. I too try as hard as I can to do what the other Dojo teachers and students do when I visit them.
I have found too there are points that can register better with me when presented in a different context so even if I may not perform a technique in a new way I did get a better understanding of some principle because it was demonstrated to me differently.
Jun, I suppose as in many other things there can be different reasons for isolating students. Its to bad when it comes from insecurity.
I consider myself very lucky in that our Shihan will say to us at times what he shows us could be done another way and it is not wrong just different.
He will even talk about how it was done pre-war vs. what is favoured now, etc.