Starting with Kiyokimi, instructors at the Academy began to have personal interactions with their students as master and pupils, leading to the creation of a kind of school clique as well as a more concentrated effort by instructors like Kiyokimi truly to teach their students (of course, the contribution to this new system made by Kiyokimi's talented successors Koreyoshi and Michizane is also quite large) and as a result, the position of Monjo hakase became a more or less hereditary one, held by many from the Sugawara clan; this earned the clan the resentment of all the other Monjo hakase, especially MIYAKO no Haraaka (uncle of MIYAKO no Yoshika), who insisted that ability (real merit) should be the key to success, not birth privilege or personal connections.
清公以後、博士が学生と私的な師弟関係を結ぶきっかけとなり一種の学閥の形成が進むとともに、子弟の教育に力を注いだ（勿論、後継者である是善・道真の才能による部分も大きいが）ことによって菅原氏から世襲的に文章博士が輩出されるようになったため、才用（実力）があれば家柄や人脈にとらわれず評価されるべきであると主張した都腹赤（都良香の伯父）をはじめとする他の文章博士の反感を買った。