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1 The Ninja (other than Zane), Wu, Garmadon, and Nya all do Spinjitzu together at the end of the intro.  It reveals that Sensei Garmadon's Spinjitzu (purified of Darkness) is a dull silver, and Nya's Spinjitzu is a dark red.
He once stated 'to know Sanchin is to know karate'. Sanchin is also used I believe in other Okinawan disciplines although a bit different in form. I have never heard of Sanchin Ryu and your initial intuition may be very accurate. Try the direct route...ask the school owner and see what he says.