The case against Galzria:
Mafia have the most likelihood and tools to be able to fish out the incorrect LaLight claim.
Once Galzria knew with relative confidence that LL incorrectly claimed role, the VT-ness of claiming candidate is a somewhat free grab since he can guess with decent probably that the SK will be dead.
Galzria looks much scummier in retrospect than he did at the time with the Poisoner/II debate, as he was pretty effectively setting up the non-poisoner-but-scum lynch multiple days in.
Shoulda listened to Teproc.
PPE: Have to think about Eevees claim, but please no claiming until we have an established order
Teproc himself admitted the case to be moot if Iguana was scum.
Regardless, Yes, you're correct that scum would've had more tools to figure out LL's claim was inaccurate. But I had enough knowing just my bid.
Your follow up argument doesn't logically follow however. LaLight made a mistake with his claim. If I'm Mafia, I know it to be simply that - and not a mixed up claim with a partner. Given that, I would have no indication that LaLight was the SK. As it happens that Gkrieg was also town, it's entirely possible that town!LaLight jailed SK Gkrieg. Or that town!LaLight effectively doctored town!Gkrieg. There would be no guarantee or likelihood of the SK being dead at all.
The last point is also moot. I could've stood by iguana or not. It was completely clear to anybody that regardless of my view, a Poisoner Kill was going to result in an iguana lynch. Arguing that I facilitated this or created it is simply inaccurate.