After watching sumo for many years and thinking about it, my feeling is that the only way to handle the problem of henka is to change the rules of the tachi-ai for sumo. I doubt very much that this will happen, given the conservative nature of the Kyokai. Instead of the wrestlers themselves determining when a bout starts, the gyoji could make a dramatic gesture after which the bout is officially started. It could be similar to drag-racing, where a series of lights go off after which the cars cross their respective lines and the race is on. This business about henka violating unwritten rules of courage and sportsmanship in sumo is too vague for my taste. Heck, I remember former yokozuna Wakanohana III (brother of Takanohana) using henka sometimes in important bouts. Even his brother criticized him for it, but it made sense. Wakanohana was a small yokozuna and needed to sometimes use guile rather than power to win bouts. Mainoumi used to jump aside quite a bit, and so did Kyokudozan. Small, fast rikishi will always use henka to gain an advantage in sumo, more than bigger, less mobile ones. As fans we should just accept it as part of sumo.