Having made him marry Yoshimoto's niece, Tsukiyama-dono, had a political aspect, but on the other hand, there is a viewpoint that it was a kind treatment of welcoming him into the Imagawa clan.
姪である築山殿を嫁がせているのも、政略的な一面がある一方、一門として迎え入れる厚遇という見方もある。