The hiragana is not an error The mixed kana writing system was carefully designed by Nakasone Seizen The choice of hiragana and katakana does reflect phonemic differences The phonemic transcription is designed specifically for the Okinawa Nakijin h gen jiten 1983 and not for other purposes It only represents the dialect of Yonamine Nakijin Other dialects require their own schemes After all there is no such thing as a Kunigami word in the real world Misleading readers into believing unstandardized things as a standard constitutes original research What is doing is even worse He is promoting weird schemes that can not be found outside Wikipedia