I dont killed Kenny just because i was reading a book. I think the killer might be Axzytiu because he is ultimate parkourist, so he was able to very quickly escape from bathroom through the vent. Or Javon because he is ultimate chef, he knows how to use knifes, so he was able to use butcher knife to easily kill Kenny. But there is something that i have to think so killer used butter to use vents.
So I think Michalina is the killer, because Yuri was wearing completely new clothes. So Michalina saw new materials in the box in the storage room and while taking them the box fell on the ground.
Wow there's so much good teories. The footsteps tha Cargo heard might be that Nils saw how culprit kill Keita but Killer sw him and started to run after him?