From Nobuyori's perspective, Kiyomori remained a potential ally who might cooperate, given their marriage ties (Nobuyori's son and heir Nobuchika was married to Kiyomori's daughter).
信頼にしてみれば嫡男・信親と清盛の女の婚姻関係により、清盛も自らの協力者になると見込んでいた。