Hmmm.... If Ryukyu retains its independence, does that mean that Ryukyuan survives as a separate Japonic language? Does the southern complex of languages get swamped by the northern one, since the Kingdom is based in the north?Sandwiched between the Japanese home islands and the island of Bireitou was the Ryukyu Kingdom, an independent polity and Ming tributary that managed to retain its sovereignty after Japan became a Ming tributary in 1607