This is for all the instructors and parents...how do you deal with this? I'm not talking about faking an injury because they're losing in a tournament. The child is saying that some part of his body is injured, and miraculously he is able to continue if you put him to roll with a weaker opponent. But during the match (which he will dominate), he will still fake the injury so that he can use it as an excuse to not face tougher opponents. He may limp, hold his arm, etc.
We've all done this as children. You take X-Rays, and there is nothing wrong with the arm. How do you resolve this because obviously it's a psychological issue.