The purpose of this is considered to have been to contain the resistance of Motofusa by using the authority of Emperor Takakura, whose junbo was Seishi, and gaining time until Motomichi grew up to become chief adviser to the Emperor and uji no choja.
これは、盛子が准母となっていた高倉天皇の権威を盾に基房の抵抗を封じ込めると同時に、基通が成長して関白・氏長者になるまでの時間稼ぎと見られる。