Talking and teaching are not the same thing. Giving verbal "feedback" can be a stimulus to sempai as well as to kohai. Disseminating cultural idiosyncracy should not the goal of aikido be. I am not saying the Japanese model is flawed; it is Japanese. I am not, and neither are my teachers or training partners. My paradigm is radically different than the Japanese paradigm, but Aikido is a universal subject. Kind of like the finger pointing at the moon. I am not interested in what the finger looks like. Here is a good article that can be found on the Aikiweb.