In history societies, a theory that Prince Oama called for ekirei in order to look for Takasaka no Okimi's reaction and use him to help their transportation if possible, became established after an argument over the Jinshin war was planned or unplanned in 1950's.
歴史学界では、1950年代の壬申の乱計画・非計画論争を経て、大海人皇子が駅鈴を求めたのは高坂王の反応をうかがい、あわよくば自らの移動に役立てるためであったとする説が定着した。