It can also be assumed that Nobunaga could never divorce Nohime due to a dispute with the Saito clan led by Dosan's opposing older brother Yoshitatsu SAITO, because it was essential for Nobunaga to keep Nohime as his lawful wife, for he received the letter from Dosan in which Dosan appointed his son-in-law Nobunaga as successor of Mino Province, and in addition, it can be understood that Nohime did not die of sickness or some other reasons before the Capture of Mino Province, in view of the fact that Nohime encouraged the attack on Mino Province for she was the daughter of Dosan and was linked by blood to the Akechi clan, a branch of the Toki clan (however, she wouldn't be linked by blood to the Toki clan if Yoshitatsu was actually the son of Dosan), which could give her husband Nobunaga a good reason to be the legitimate successor of Mino Province, and also that the high-ranking officials of Mino Province were treated the same way as those of Owari Province.
また婿である信長を美濃国の後継者と定めた道三の国譲状がある以上は、濃姫を正室としておくことが信長にとっても必用不可欠であった事もあり、その道三と対立した、兄・斎藤義龍筋の斎藤氏との諍いにより離縁して実家に返したという可能性は考えられず、美濃攻略を推し進めて行った背景には道三息女であり、また土岐氏の傍流明智氏の血を引く濃姫の（義龍が道三実子であった場合、土岐氏と血縁関係はない事になる）、婿である信長こそ正統な美濃の後継者であるという大義名分があったためという推測も成り立つこと、美濃攻略後に美濃衆が尾張衆と同様に待遇されていることからも、濃姫が美濃攻略前に病気などで亡くなったという可能性もないと思われる。