In contrast with his military prowess which held even Masashige in fear, he showed a brilliant talent for waka (traditional Japanese poems); therefore his works were chosen in "Shinshoku Kokinwakashu" (an Imperial anthology of wakas made in the Muromachi period).
正成を恐れさせたほどの武勇を持つ反面、和歌にも優れた才能を発揮し、新続古今和歌集には公綱の作品が修められている。