The MC knows (I hope) for a fact that bob is the traitor, since he saw who owned the 5 bullets. He also knows 4 of them were shot, 3 on Kei/Satone, and 1 on the meat shield. He also mentioned how she gave him her only black bullet, so her collecting the 10 is out of the question. He knows that the hired killer and her are in a team. I also hope Kei is alive, after all he doesn't do anything unnecessary, so if hes alive, that hopefully means Satone is also alive. Going back to the detective Yuuichi left, I'm pretty sure he's still alive. Yuuichi had no black bullets, so why would he shoot him with his gun? We also don't directly see whether or not Yuuichi shot at him, after all, we only got a black screen with a "BANG". Im also pretty sure we're nearing the end (link below this comment by sakalol) since their debt was only 500 million, Yuuichi's team as of leaving the shit has 1.3 billion, more than double what is needed, also if they defeat the hired killer, he'll gain A LOT more. Im assuming this is nearing the arc where they defeat tomodachi game since I cant see there only being 5 people who leave. Unless the 5 people leaving thing was a lie.