Afterwards, Yoshinori attempted to expand his power throughout Kanto by having his own son made Kanto Kubo, but withdrew the plan in the face of opposition from the Uesugi Clan.
その後は関東に自己の勢力を広げていくために実子を新しい鎌倉公方として下向させようとしたが、これは上杉氏の反対にあって頓挫している。