This was said to have been Yoshinori's plot to back Iezumi as a member of the Bakufu group in opposition to his cousin, Mochikuni IWAMATSU(a child of Mitsuz umi's younger brother Mitsuharu) of the Kamakura Kubo group, who had succeeded the IWAMATSU family after Mitsuzumi's death.
これは満純の死後、岩松家を継いだ従弟（満純の弟・満春の子）の岩松持国が鎌倉公方派であったため、家純を幕府派として擁立しようという義教の策略だったといわれる。