In reality, additional personnel definitely attended the meetings, this would have included: Okubo and Yamaoka from the Tokugawa family side, and Shinpachi MURATA and Toshiaki KIRINO from the 'expeditionary force to the east' side.
しかし、実際には徳川家側から大久保や山岡、東征軍側から村田新八・桐野利秋らも同席していたと思われる。