I think the narrator is unreliable; after all, back in Chapter 82, it said that Sansui was "struggling" against Saiga, when it was an exhibition match where Sansui was not supposed to win but to show off (and make Saiga look good because he's going to be marrying Sunae, while also showing off the power of a vassal employed by the House that Toun would be marrying into). He wasn't really struggling at all.
So I wonder if Pandora and Shun, as well as Kakejiku, could really take on Sansui and Suiboku.
Like, before, yes, I could see Pandora's power working against Suiboku because he wanted to live in order to get stronger.
But as they are now, they suppress, or lack, material desires, among which would be the desire to live.
Especially, with Shun's mention about the assassins lacking the resolve to die; Japanese swordsmanship and combat philosophy, which Suiboku's teachings are based on, make a big deal about resolving to die and winning through overcoming the fear of death. I think a fight with Suiboku or Sansui would not go as Pandora hopes it would.
No idea about Kakejiku, though. Like, she could probably use Light Step, Flash Step, and other Sage Arts, but would she be able to use the Heart of Sagacity to actually fight like Suiboku and Sansui?
