I like the argument for Hyogoro, but not for Kawamatsu. Kawamatsu did not spend much time in Ringo pre-Kaido/pre-Grave-robbery.
Onimaru only cried for Kawamatsu, because years after the fall of Ringo, Kawamatsu went to Ringo to commit suicide, but didn't because he found out Onimaru was protecting the eternal graves. But Kawamatsu did know details of Ushimaru so I concede to your possible conclusions.
But yes, I hope we get a more detailed look at Ryuma's shrine/gravesite. Hopefully, there's picture so Oda can have Zoro say "Weird looking guy" even though Ryuma looks just like him.
Onimaru only cried for Kawamatsu, because years after the fall of Ringo, Kawamatsu went to Ringo to commit suicide, but didn't because he found out Onimaru was protecting the eternal graves. But Kawamatsu did know details of Ushimaru so I concede to your possible conclusions.
But yes, I hope we get a more detailed look at Ryuma's shrine/gravesite. Hopefully, there's picture so Oda can have Zoro say "Weird looking guy" even though Ryuma looks just like him.