However, Nobunaga ODA in fact received an imperial recommendation for 'appointment to Seii Taishogun,' so realistically there was no basis for the idea that one could not be Shogun if he was not from the Minamoto clan (it seems that the reason Ieyasu claimed Minamoto heritage was not only to become Shogun, but that by becoming the Minamoto clan chief and entering the post of Shogun, he would oppose Hideyoshi's warrior Kampaku system and aimed to gain authority to rule over both the warriors and the nobles).
しかしながら、実際に織田信長に「征夷大将軍拝命」の勧めの勅使が来ていることもあり、現実的には源氏でなければ将軍になれないというのは根拠がない（おそらく家康が源氏を称した理由はただ将軍になるのではなく、源氏長者となり、さらに将軍職へ就くことにより、秀吉の武家関白制に対抗し、武家と公家の双方を支配する権利を得るのが目的だったのであろう）。