Zybr
Auto-translated
I believe that using Sion is only beneficial if you implement the strategy I described earlier, involving a player who is not on Nox's team. Because the probability of killing someone from the mafia on the first night is 1/5, and the probability of a successful defense is 1/4, assuming Nox is the target. At the beginning of the game, this is disproportionate to the attention it draws, and I think the simplest strategy is for Sion to stay home and not make any moves until the middle or end of the game. But since we're talking about a different scenario, where they're clearly protecting their own, then... Although, who knows, maybe they really made such a mistake, but I'm still more inclined to expect strong opponents.
1) Nox takes the risk of protecting someone who isn't on their team and has a chance to save someone from the other team.
2) They hope that Kayle will be killed on the first night, randomly! Otherwise, a 1 in 3 chance is simply wasting the defense on imaginary adventures, as so many nuances need to align. With a 1 in 2 chance, your description still works, but it needs to play out that way.
3) On the first night, the Noxians, who don't have innate protection abilities besides Sion, risk exposing both of their main killers to attack in order to potentially eliminate one innocent player over a couple of days.
Барон "Vampires"
Отдай свои прошлые сны,
В сомненьях себя обрети,
В бешеном танце душа кружится!
Не думай, что будет потом,
Здесь и сейчас мы живем,
Стань хоть на миг сам собой, слышишь!