Through the diplomacy that Sotsuhiko had with Korea as described above, it is likely that number of immigrant groups that have been settled in the Katsuraki region contributed in stregthening Katsuraki clan's economic power by being engaged in handycrafts such as smithery (arms and weapons) under the control of the Katsuraki clan.
先の襲津彦伝承に見たような対朝鮮外交を通して、葛城地方に定住することになった多くの渡来系集団が、葛城氏の配下で鍛冶生産（武器・武具などの金属器）を始めとする様々な手工業に従事し、葛城氏の経済力の強化に貢献したとみられる。