In order for shugo daimyo, shugodai, and kokujinryoshu to become a sengoku daimyo, it was necessary to abolish the ties of their loose alliances with shoke and local clans under them that began before the Muromachi period and then to obtain vassal groups with which they were tied based upon a strong relationship of master and vassal.
守護大名や守護代、国人領主が戦国大名になるためには、それは室町時代以前からの庶家や傘下の土豪とのゆるやかな同盟関係のしがらみを絶ち、強固な主従関係により結ばれた家臣団の獲得こそが大きな条件であったといえる。