You mentioned his hieght and weight. You realize he wouldn't actually be learning to defend himself at that age, right? Otherwise the last 3 posts were all very good. If it was my kid though, I wouldn't risk making him more aggressive, unless the instructor was a really good person. They are very hard to find though.
Just a little nit pick, sensei is a japanese title, not a martial art's one. So martial arts besides japanese in origin would not call the instructor sensei.
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