There is debate as to the validity of the Ueshima family document; however, a Hanshu (old name for part of Hyogo) Nagatomi family document which was found later coincides in content, supporting the opinion that the document is indeed valid.
この説は、この上嶋家文書の真偽をめぐって意見がわかれ、後に発見された播州の永富家文書がこの文書と関係をもつことを傍証に、この記載を真とする意見もある。