The fact which can be regarded to be true is that 'Sukemichi SUDO served Yoshiie' and is not that 'The Yamanouchi-Sudo clan who was a local lord in the Sagami Province was also Yoshiie's Kenin (retainers).'
事実と見なしうるのは「首藤資通が、義家に仕えた」ことであって「相模国の在地領主山内首藤氏もまた義家の家人」ということではない。