MIZUNO looked at the point that the Emperor Kanmu's edict summarized 'to accept the Imperial Throne according to the law that Emperor Tenchi established for the first time, and to take the charge,' was modified in the Emperor Montoku's edict and it says 'to take charge of the Imperial Throne according to the law Emperor Tenchi established for the first time,' dropping the words 'to accept.'
水野は、桓武天皇の詔で大略「皇位を天智天皇が初め定めた法に従って受け、仕えよ」とあった箇所が、文徳天皇の詔では「受けよ」が脱落して、「皇位を天智天皇が初め定めた法にしたがって仕えよ」となっていた点に注目した。