Speed ran more playthroughs with the skip button, including an evil/defiant run and trying the other attack option during the trial. If the conspiracy theory is not true, I know who the three current demonhearts are because they are the only ones, outside the protag herself that we obviously know is a demonheart, who don't potentially die and stay dead during one of the fights. The questions become which one of the other two killed someone to become a demonheart themselves and why, and which was already a demonheart from the start.
Also, it'd be nice if there was an option to offer to take the blood test and be crafty about deceiving the others by continually renewing the injury to make it seem like there was normal healing time needed. Or to bring up that someone else could do so, thereby making it pointless unless everyone stays in each other's presence 24/7 to watch for subversion; which also means no one gets anything done and we're all stuck tolerating each other without relent. Anything to throw some doubt on the process, if that's the route a player wanted to go down, besides flat out refusal to play along. But that's probably too much variation to try accounting for in game path layout.
Anyway, this has been interesting to explore. Still have lots of questions as to why the event was orchestrated by the "master" to begin with (outside the fact he's an evil sadist with a penchant for toying with people), what Raze's promised "reward" is for helping the master/why he's playing along with any level of faith he won't get backstabbed later on, and what the various companions' motivations are to act like they have been because they're still ultimately strangers to the protag and we can't discern much as it is. Hopeful for chapter 4 to start giving some clues to puzzle this out further.