User blog comment:Kaido King of the Beasts/Chapter 818: Stepping Stones to One Piece/@comment-7606564-20160303181833/@comment-71.13.82.131-20160304144022

If everyone has such a limited knowledge of the poneglyphs they likely have no idea of a Rio Poneglyph. From what we have seen of those that have been to Raftel, they don't talk much about it even if it means death.