However, as conflicts over the territory intensified, koso became a cause of conflicts between the lords of the lands where farmers lived and where the farmers worked, because the former intended to expand their territory by ruling unitarily over the inhabitants and the lands but the latter aimed to invite more farmers into their territory to work.
しかし、堺相論などが盛んになると、それは領民と土地の一元支配を名目として支配地域拡大を図る居住地側領主と耕作者の取り込みを図る耕作地側領主による対立の一因となった。