I've already provided an explanation previously for why the fake first twilights are randomized.
http://forums.animesuki.com/showpost...ostcount=11133
http://forums.animesuki.com/showpost...ostcount=11541
I'll repeat it again though. The mastermind selects accomplices or "subculprits" that form different groups. I chose 3 groups so it fits with the rock paper scissors analogy. Since each group has a different leader in each game most of the other accomplices in those groups are also different in each game. So if for example if Kanon were the leader of the fake death group in episode 3 he'd chose mostly servants. If Eva were in the rekilling group she'd pick Hideyoshi and so on.