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I think that using Sion is only beneficial if you implement the scheme I described above with a player who is not on Nox's team. Because the probability of killing someone from the Mafia in the first night is 1/5, and the probability of a successful defense is 1/4, assuming they kill Nox. At the beginning of the game, this is disproportionate to the resulting exposure, and it seems to me that the simplest option is for Sion to stay home and not make a move until the middle or end of the game. But if it's not him, but a variant where he protects his own, which is clearly an IO player, then... Although, who knows, maybe they really made such a mistake, but I'm still more inclined to expect strong opponents.