He was the first noble from Kiyomori's grandchildren; and, as Kiyomune surpassed Koremori and Sukemori, his elders, it became clear that the main branch of the family shifted from the Komatsu family to Munemori.
清盛の孫では最初の公卿であり、年長である維盛・資盛を超えたことで、平氏の嫡流が小松家から宗盛に移ったことを示すものとなった。