One of the causes for this was the matter of the Isshiki clan being on bad terms with the Shoni clan; the Shoni clan was for the Northern Court's (Japan) side, the same side of Isshiki clan and Shoni clan used to be the chinzei bugyo (a magistrate of Kyushu region).
原因の一つに、同じ北朝(日本)方である元鎮西奉行少弐氏とは不仲だった事があげられる。