In "Azuma Kagami", it says that Kagetoki begged to be Betto for only a day and Yoshimori allowed this because he was planning to visit his territory but Kagetoki took over the position with a conspiracy plan.
『吾妻鏡』によれば、景時が「一日だけでも」と義盛に頼み、所領へ帰る暇のついでに職を預けたが、景時の奸謀によってそのまま奪われてしまったという。