Ryukyuan and Japanese common origin around kyushu.

Intresting thing I found out recently that majority of ancestry that ryukyuan and Japanese people share comes from the area of kyushu. The Japanese diverged and expanded north while in 11th century with the gusuku period the ryukyuan went south expanding the japonic language and culture to okinawa.

Though what I'm surprised in how fast japanese and ryukyuan language diverged