This is an instance with a closed venue, where the castle owner has established rules. Thus, special attention should be paid to certain details. The servants are not real people; they are the hands, feet, and tongues of the Puppet Maker. If 'breaking the rules' and 'punishment' require being 'seen,' then being 'seen' by the servants is equivalent to being 'seen' by the Puppet Maker.
It is unknown whether the three middle-aged people did something other players didn't do last night—but this also doesn't hold absolute representativeness, because making only three mannequins a day doesn't mean only three people can be chosen to become mannequins on the first day; perhaps some are arranged for the second day.
The 25th person did not sit in the chair prepared by the servant, which could be the main reason he became the first mannequin. Naturally, he also died early, but it was not at the hands of the Puppet Maker.
