Oh, sure, A can definitely have killed B. I've done that shit before and used the exact logic that mafia was framing me since it'd be too obvious if I was the killer. But considering the fact that A in this case is Hayumi, I really don't think he would have killed Dest. I lean town on him, he's done a few things in this game I don't think a scum Hayumi would do. It's been stated multiple times that Hayumi hates fake claiming and him fake claiming miller wouldn't make sense and I'm inclined to agree with that. Sure, he can use reverse psychology here but I think more likely than not, he's town.