Look, I don't trust spurge either. But miller is a tough role to counterclaim.
This is the meta:
A miller exists in order to give the antitown some leeway against the cop. The cop can be a very overpowered role in the right hands, and sometimes can be just downright lucky.
However, it is almost a necessity that for there to be a miller, there has to also be a cop, though there has sometimes been games with a miller and no cop. however, having a miller, and a role cop and no actual cop, is just bizarre.
Let's say, that for the sake of importance, the cop should claim tomorrow.
If the cop actually exists, that will help confim spurge's role, and without the counterclaim, be pretty undeniable.