This is quite unlikely but its just an idea. I noticed that in kingdom hearts 2 when you find riku in the world that never was his left hand is wrapped up as if injured. When he joins your party he doesnt seem to use that hand much for anything. When running his left hand stays stiff by his side while the other moves back and forth and its the same during battle. The link I noticed was that the E.S had his left arm frozen by the U.E.M in the new secret ending. What do you think?
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