It's not required in Missouri - I kind of like that. The kid that loses just wants to get off the mat after the match and he/she is not listening to whatever the opposing coach has to say. If a kid is going to make a mistake its usually after he leaves the circle after the match - just let the kids go to their corner. If the sport requires it, then have them shake the coaches hand before the match. I don't see the coaches shaking hands at the conclusion of the match like they do in other sports.