The two senior envoys were representatives of Christian daimyo who were chosen from those that were related to those daimyo, but blood relationship was not strictly assessed for the vice-envoys.
また正使の2人はあくまでキリシタン大名の名代ということで、彼らとの血縁にあたるものが選ばれているが、副使に関してはそこまで厳密に血縁は問われなかったようである。