As "Kinpisho" (a book written by Emperor Juntoku, which records the history and origin of imperial court ceremonies and sets forth the rules and etiquette for carrying out such ceremonies) described Suino as 'Kurodogata Issaibugyo' (the head of Kurodogata), Suino played a big role in the management of Kurododokoro and was involved in many jobs at the Imperial court.
『禁秘抄』には、「蔵人方一切奉行」と記され、蔵人所の運営の実務面で大きな役割を果たしたことが記され、朝廷の各方面に関わるようになる。