The Nanasawa Fort was an important point in the Sagami Naka County and the Oba Fort where he later protected was an important point in the Sagami Higashi County, and therefore, it is considered that Tomomasa was in the position that substantially ruled both counties by the Ogigayatsu Uesugi clan.
七沢要害は相模中郡の、また後年守備した大庭要害は相模東郡の要衝であることから、扇谷上杉氏の両郡支配を実質的に担う立場にあったと考えられる。