So here’s the key to finally prove that Isaac was not a Fool. In dead chat at the SoD one of the first things FK mentioned was that he was a GK and that he was defiled. For him to mention this and for Isaac to later flip as Poss makes it that unless this was extreme coincidence that this is in fact a Possessor game and that Isaac was likely the NK.
In short, I doubt either Meteoro or Isaac were Fools.