Motofusa was a very much trusted vassal of Goshirakwa, and it would cause serious damage to the Taira clan if the sekkan family territories owned by Motozane were transferred to Motofusa.
基房は後白河の近臣として信頼が厚く、基実の領していた摂関家領が基房に移動すれば平氏にとって大打撃となる。