Funny.. I was at a tournament... one of my first few (I was a white belt), and there was a guy there (Yellow belt).... really nice guy, very good technique, after the kata compitition was done, and the medals were being handed out by the head judge, the guy was pulled aside, and in front of us was very sternly talked to about switching styles. I guess he used to train in Kung fu, or something like that, and was a higher rank, then decided to change styles. The judges thought it was unfair, but the way that I see it, he changed styles, started at white belt, and was working his way through... is that so bad?