Although Munetsuna himself died young, his grandson Muneshige SHIMOTSUMA (Reni SHIMOTSUMA or Reni SHIMOZUMA) became a disciple of Shinran, which led to his descendants' development as the Shimotsuma clan (the Shimozuma clan) as senior vassals of Hongan-ji Temple.
宗綱本人は若くして死去したが、孫の下間宗重（蓮位）が親鸞の弟子となったことを契機に、その子孫は本願寺の重臣下間氏として発展する。