ne of these people killed at some point, either T1 or T2 or both - Eva, Hideyoshi, Rudolph, Kyrie, Rosa - either Kyrie or Rosa, if it's Rosa, Maria killed someone
so culprits are among Kyrie, Rosa, George, Battler and Maria.
what i thought could've happened is
T1 - Rosa kills everyone else, Maria covers for Rosa
T2 - Rosa kills Natsuhi AND Krauss, hides in their room and gets locked, they didn't search for killer in the room
T4 - Maria kills Shannon - she can't kill anyone else tbh and she has to kill someone
now there's a problem
who's the third killer? who's 2nd suvivor?
maaaaaybe, doctor kills kumosawa, faking Gohda's death
then Gohda kills doctor and Jesicca
this still leaves us with 4 people and i assume it's nowhere close to truth