Since Takeshi UMEHARA, a philosopher, expressed his view concerning these two mysterious persons in his book, "Mizusoko no uta - a View on KAKINOMOTO no Hitomaro," that they were the same person, a considerable number of researchers have supported this view.
謎の多いこの二人について、哲学者の梅原猛が『水底の歌-柿本人麻呂論』において同一人物との論を発表して以来、少なからず同調する者もいる。