Yup, those are the Ainu (Kennewick Mans relatives) and the Jomon were before them. I saw a program the other night on the Samurai and the most honored Samurai in history was over six feet tall, he is also the one who began the practice of Harakiri.
There is a thought out there that the original Samurai were the Ainu, taller, bigger, hairy and light skinned. Some even say the Japanese practice of 'white face' is an emulation of these ancient 'royal' Samurai.
Were he over six feet tall, suicide would have been unnecessary as he would have been continually banging his head on door frames. Instead of harakiri, it's entirely possible this hairy guy originated the ancient Japanese phrase, "Knock yaself out."
The Ainu and the Jomon are the same people. Jomon is an earlier culture/type of pottery. The Ainu were not Samurai, so to speak, but they did lose a long series of wars against the Japanese. They were driven up to Hokkaido.