What does it prove if a 6U can wrestle 8U competitively? For every "instant talent" there are 99 regular kids. I really don't think there will be any long term gain or loss to any 6U wrestler's potential if they wrestle within their age group, for the state tournament series, just like everyone else does. If they are dominating then make them work on different aspects of wrestling. Single legs, double legs, duck under, high c, cut the other wrestler, work on tilts, work on reversals, work on escapes, use it as a learning opportunity. Bump them up in open tournaments, take them to bigger tournaments, but even the most talented 6U will not be handicapped by wrestling inferior competition at this age for the state tournament series. Before you know it he will be a FR in high school on the mat with a senior and you will get to see how he does against older, more experienced competition.