Or are you hinting that Arko is such a popular target for murder that they decided to play it safe and heal him, blaming House if anything goes wrong?
Okay, then House didn't go out on the first night. That means he's either Silver or Arko (and Moriarty healed him for some other reason).
But I don't believe that in this case, they wouldn't have thought to write a note that night, saying that, lol, Toxic is a loser, Zubrik is right, Moriarty healed him.
Enough analysis for you?
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Zubrik, tailoring roles to players is not newspaper analysis. It is a consequence of it and many other factors. So, next time, express your thoughts more clearly.
Added 1 minute ago
Tox, there are three suspects. These are "What?", Jack, and Mortulus. Each of them could have killed on the first night, there is evidence against each of them, and there are certain nuances for each that logically explain why the killer didn't kill today.
But you won't dare to execute any of them because you think the killer might be useful to your team, right, mafia face?