From a children's song that says 'Sanada like an ogre accompanied by Hideyori like a flower fled as far as Kagoshima' was popular in Kamigata after the fall of the Osaka-jo Castle, we can surmise that there were a rumor about Hideyori's escape and survival and that Hideyori did not die and was secretly relieved by a busho who enjoyed Hideyoshi's favor.
また、大坂城落城後に上方で「花のようなる秀頼様を、鬼のようなる真田が連れて、退きも退いたよ鹿児島へ」という童歌がはやったことなどから、秀頼は死亡しておらず秀吉恩顧の武将により密かに救出され落ち延びたとする脱出・生存の風説が流れたことがうかがえる。