It is guessed that masterpieces such as "zuijin Teike emaki" (guard horse picture scroll) owned by Okura Antique Collection House and "hand-scrolls of the Thirty Six Immortal Poets Satake version" of Satake were in fact produced by Nobuzane and jointly produced by painters related to his family line.
大蔵集古館所蔵の「随身庭騎絵巻」や佐竹本「佐竹本三十六歌仙絵巻」などの作品は信実とその家系に連なる画家たちによって共同制作されたものと推測されている。