We have a new student for the past 7 months. Now he's a new student to us, but he's a black belt in another system of Korean/Shotokan mix. Sometimes when he speaks to our other students he'll tell them some of the techniques were doing is wrong. We should do them differently because the way he was taught to do them was faster. I don’t see them as faster. They almost look identical. Now we're primarily Okinawan Shorin Ryu. But we're our own version of it. My teacher and I have made changes to our training over the past 10 years. What bothers me is not the fact that he interjected his opinion and tries to show other students his way. What bothers me is then to have other students say oh yes that's much better. No I'm not the teacher and it is not my school. I want to ask this student why are you here? Another issue we had is when we were sparring doing grips trying to get each other out of a circle, We call it Tagumi. He used a little throw bringing me to the floor. I took him with me. ;) But he knew that the drill didn't involve throwing it all. It was a mutually agreed-upon set of training criteria and he broke that agreement. And I wore it and didn't retaliate in any way.(Well maybe a little). And now although my teacher doesn't see it I just have this feeling that although he's a nice person his intentions are not good with us. I am also starting to lose my patience with other students. If they feel that they like the way he trains, go there. Maybe because our classes are loosely structured it invites this kind of activity but we never had this problem before. I glad I am not the teacher. I even thought of leaving and going to do something else for a while. Am I being too critical? or maybe I'm thinking of this in the wrong light? Please, anyone, give me another way to look at this. Training has become not enjoyable for me.