To Jimmmmm:
Ichi claimed at L-1 (right?) on Day 2. He could likely have been the lynch. Now
But in the case of Row 3, [...] The four claims would then be BP, JK, Bodyguard and Psychologist, and there are no possible setups which have a Psychologist and two of the others - the only possible setup with these four claims is Row 3, which excludes Psychologist.
This is true, but it requires some thinking about the setup. Is it possible he just looked at all the PR's that weren't on Row 3 U Column 3, that is, {Watcher, Goon Cop, Psychologist}, and picked one? Out of these three, psychologist has the advantage that he doesn't really need to "clear" people; it's not as accountable. He gets "can't kill" and the turn up Mafia or SK, well, maybe they had already killed.
I think your argument requires optimal play. Honestly, if I was coming up with a fake claim, there's a good chance I might not choose carefully enough.
From you it's certainly Silver vs. Ichi. Your argument implies Ichi couldn't have claimed what he did as scum, so it has to be Silver. Is there another reason you think it's Silver (besides the opportunistic fear of having 3 IC's)?
For the rest of us, we have no reason to believe Jimmmm is confirmed, right?
If it isn't clear, I'm operating under the assumption that all town PR's have claimed, so there aren't two liars in the set of four claimers.