There are also such opinions as that of Kei MIKAWA, who considered that the initial purpose of insei was to control the right to decide who would succeed the throne; this view places importance on the fact that the expansion of sovereignty was intended.
しかしながら美川圭のように、院政の当初の目的を皇位決定権の掌握と見て、王権の拡大を意図したこと自体を重要視する意見も出ている。