Re: Talk or not to talk?
During class, I'l talk about the technique if the teacher requests me to. Otherwise I mostly stay quite. Almost everything I have every said uninvited was wrong. I don't mind if people tell me what I'm doing wrong and how to fix as long as they can do it while we train. Unless they are the teacher I may or may not pay any attention of course.
I just reread an article on Shadow Teaching from Aikido Today Magazine. Good article, but I had the hard copy, so no link. It lists the evils of someone beside the teacher trying to teach on the mat.