Further, in the August issue Susumu ONO introduced both theories and presented his own view in 'Old Japanese Vowel System,' which was, in turn, countered by Matsumoto, in 'Concerning A-type and B-type Manyo-gana Characters with the Vowel of オ (o)' in the November issue, and by Hattori, saying 'Old Japanese Vowel Phonemes were Six, not Eight' in the December issue.
さらに8月号では大野晋が「上代日本語の母音体系」で両論を紹介し、持論を展開した他、11月号では松本が「万葉仮名のオ列甲乙について」で、12月には服部が「上代日本語の母音音素は六つであって八つではない」で互いに再反論した。