On second glance, I think ZV's role was real, as it's "Fake-Cop" and not "Fake Cop" i.e. he would have gotten results about whether or not a role was Fake.
So this is the setup v1:
Fake
Fake
Fake-Cop (gets Fake/Not Fake results)
Role Cop (gets role name, but not Fake/Not Fake)
Claims:
Me, Fake
Vult, Fake
Ryu, Jailer
Ran, Fake
Doop, Fake
We know there's a scum executioner. This is contrasted by the cop duo, which adds speed to the town figuring out the Fake ruse. But there's a question about whether or not that's enough in terms of balance, and while it's WIFOM in a sense, having two identical roles (Fake 1-Shot Vigilante) would also speed up the process for town figuring it out, but then it would also introduce a possible CC mislynch. That's not bad on balance.
So from my point of view, it's either Vult/Ryu or Ran/Doop. I lean towards Ran/Doop, because a jailer seems appropriate to counteract the scum executor. This wouldn't be a power counter, obviously, since executor would be a Day ability. Instead, Jailer would exist to possibly stop an NK, which would offset the discussion loss from the Town quicklynch, and more importantly counteract the scum execution being an alpha if used in lategame.
If there's no jailer, then Ryu is scum which opens up the possibility of Vult scum. There's also the outside possibility of Ran/Ryu (in which case Ran fakeclaimed an already-claimed role for some reason), but Ryu/Doop is completely out the window since Doop claimed 1-Shot Vig before Ran did. (Unless Doop made the luckiest claim ever, or had a counterclaim role supplied to him by the mod as a safeclaim. Both options are unlikely.) This means that Doop can only be scum with Ran, not with Ryu and certainly not with Vult.
Claiming 1-Shot Vig after a 1-Shot Vig claim is pretty ballsy if it's not true, but neither player acknowledging the strangeness of it suggests either: an implicit understanding that it works in the setup to balance things (but that's not what Doop claims), or indifference (this is what Doop claims), or that the claimants are both scum banking on a CC ploy to stay ahead. The latter is a bit weird (how does it pan out?) but Ran hasn't really answered as to why he had no response at all to CCing Doop. He liked Doop's post in which Doop says he's indifferent because the set-up is "bull****", and he said to Vult that "we shouldn't rely on roles when most of the roles are fake". But what's missing from this equation is Ran's initial reaction to Doop claiming the same role as him, which there should be, even if that reaction is "haha, it's funny that Maven did that!"
My vote is on Ran at this juncture, although I'm not going to put it down until we hear from Ryu. Ran is in my two most likely scum pairs (Ran/Doop and Ran/Ryu) and I think that Doop is scum, which as I said can only be with Ran.
Ran's playstyle throughout the game has been weirdly belligerent, with an air of supposed "no-nonsense", and just aggressive overall, beginning when he stopped playing RVS within the first page of the game and focused on Vult not voting because he was on mobile. He pursued this over multiple posts. Then he got into a tedious semantic argument with Fand over whether or not Fand's question had been answered satisfactorily, an argument he still aggressively insists was relevant and meaningful. During this, he came down on me for asking Spak what he thought of Ran/Fand while it was ongoing, even though if their interaction was meaningful (it wasn't).
That's just from memory. But it's indicative of Ran's play throughout the game, which has been to put more emphasis than is warranted on many player interactions. Ran has also repeatedly and firmly put down any attempt at opposition to what he's saying. The most recent example of this was when he told Doop, as if there were no room for question, "You are claiming next. I will claim after you." This is an example of the playstyle, not a claim that the statement is inherently scummy, but subsequent questions on his reasoning make his motivation questionable. Moreso, it serves as a recent example to showcase the pattern. Ran often plays town by asking a lot of questions and stating a lot of opinions, but I've never seen Ran be this combattive in doing so, and I've never seen him take so much meaning from so many things that have little to none.