Incidentally, it is the most widely believed theory that Nobutoyo's core position in the Takeda family was the lord of Shinano Komoro-jo Castle, which was Nobutoyo's base to rule the eastern Shinano region; however, any documents to prove Komoro territory ruled by Nobutoyo were not found.
なお、武田家における信豊の立場の基盤として信豊が東信支配の拠点となっていた信濃小諸城主であるとする説が支配的であったが、小諸領支配を示す文書は見られない。