Also, the description of 'Nobuo Sokei' (who always followed Rikyu) found in the caption in the 'Rikyugazo' (picture of Rikyu) (drawn by Tohaku HASEGAWA), which is stored in the fushin-an (a tea room in the residence of the head of Omotesenke (the house of Omotesen), is thought to be Sokei.
また、不審菴（表千家）所蔵・「利休画像」（長谷川等伯筆）の賛の中に「（利休に常に従っていた）信男宗慶」とあるのは宗慶ではないかと考えられている。