I honestly dont care about the argument they had.
what I see is this:
Carl came in with his quotes. Nothing suspicious.
Someone comes in and tries to analyze, so he responds with more quotes.
It comes off as evasive and dismissive.
then his whole bandwagoning on nickels is full of easy reasoning. Yes, nickles is suspicious. I suspect him myself a bit, but not really a lynch im willing to risk. The ease of the wagon is way too suspect.
Though, he might be the nuke so mafia, please feel free to kill him tonight.