It is considered that his ability as the brains behind the Kujo family can be proven by the fact that he served Jidoku for five generations of Emperors, also FUJIWARA no Sadaie who served the Kujo family during the same period regarded his ability very highly.
九条家のブレーンとしての実力は、天皇五代に渡って侍読を務めていたことからも証明できるものと考えられ、同じ時期に九条家に仕えた藤原定家からも高く評価されている。