Hikan of Keicho family, including Motonaga and Nagatada, took lead in the disturbance, as they wanted to rid of Yukinaga MIYOSHI, the powers of Awa Province, by placing Sumiyuki as new head of Keicho family.
澄之を新たな京兆家当主として擁立することで三好之長ら阿波国の勢力を排除したい元長・長忠ら京兆家被官が中心的な役割を果たしていたとされる。