According to 'Family Tree of the Akita SHIONOYA Family,' there were the three family heads--Tokitsuna SHIONOYA, Fuyutsuna SHIONOYA and Michitsuna SHIONOYA--between Yoshitaka SHIONOYA and Yoshitsuna SHIONOYA, but it is contradictory to a historical fact and the existence of such individuals is doubtful.
「秋田塩谷系譜」では、塩谷義孝と塩谷義綱の間に塩谷時綱、塩谷冬綱、塩谷通綱という3人の当主がいたとするが、史実と合わないため実在が疑わしい。