However, according to an old copy of 'Rokkaku jotei josho', which was discovered while "Gifuken-shi" (history of Gifu Prefecture) was being compiled, Dosan didn't complete his domination of Mino Province in one generation, but over two generations with his father, Shinzaemonnojo NAGAI; this is now considered to be the reliable opinion.
しかし、『岐阜県史』編纂の過程で発見された古文書「六角承禎条書写」によって、美濃の国盗りは道三一代のものではなく、その父の長井新左衛門尉との父子二代にわたるものとする理解が有力となっている。