I see a lot of threads here about "starting over" and giving up rank, etc. The smartest thing I ever did when joining Jundokan was to walk into the dojo with a white belt on. I didn't see it as "starting over", I saw it as recognizing that I had an opportunity to be a beginner again and to set my mind to learning everything through a beginner's eyes. Additionally, the dojo seniors took me under their wing in a way that they may not have done had I worn my black belt. Within a (relatively) short amount of time, I had earned a Jundokan dan grade and it continues to mean much more to me than when I see others who simply walked in with high dan grades and were "recertified" in their new style. The problem is that people consider their belt color a rank and not a grade. A rank indicates position and hierarchy and other things that are painful to give up. A grade indicates your ability level in karate and is specific to the style and school you are attending. To wear a grade belt that does not match this ability level is presumptious and will only get in the way of your progress. So my advice is: let it go and let others see you for who you are and not what color your belt is. You are not starting over, you are adding to your experience. $.02 for you!!