Enough analysis for you?
If someone was going to kill Joker, then, lol, it makes sense to hide from several players, hoping that INTUITION will tell the blockers and redirect.
Or are you hinting that Arko is such a popular target for murder that they decided to overprotect him and heal him, shifting the blame to House if anything goes wrong?
Okay, then House didn't go out on the first night. This means he is either Silver or Arko (and Moriarty healed him for some other reason).
But I don't believe that these two wouldn't have thought to write a note that night, saying, lol, Toxic is a loser, Zubrik is right, Moriarty healed him.

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!