Besides, in his later years, Musashi had been enjoying a good friendship with the Matsui family, so Musashi might have known the Matsui family before the duel, and for the family's help, he might have been sent to Muni in Kitsuki.
更には武蔵と松井家との晩年の親密さから試合当時も松井家に縁があり、武蔵は杵築に住む無二の許へ送られたと考えられる。