In response, the So clan proposed not to count tokusosen (ships used to send envoys for urgent matters) among saikansen, and requested that another policy should be applied to saikensen registered under the names of their branch families, separately from the treaty for the toshu saikensen (ships of the So head house used to dispatch envoys to Korea).
それに対し宗氏は特送船（緊急の用事で送る使送船）を歳遣船の定数外とし、島主歳遣船（宗氏本宗家名義の歳遣船）とは別に有力庶家名義の歳遣船を定約を要求する。