On the other hand, there is a theory that the family assigned the Sekido clan as daikan (local governor) of Obama City, where was a maritime trade hub in the Japan Sea at that time, and extended the space of its activities even beyond the northern Japan Sea.
一方で日本海海運の拠点であった小浜市に代官関戸氏を置いていたとの見解もあり、北日本海に止まらない活動範囲も指摘されている。