Thanks a lot!
Regarding the concept of removing the load (whether it is the RC or actual comparator), that's to make sure that you are seeing only the noise arriving at the input of the comparator and no noise that the comparator itself contributes, right?
However, I guess I want to know how much noise is appearing at the input no matter where it's coming from...so in that case, it makes sense to leave the comparator in, right? Set the noise analysis output nodes to the input on the comparator, and have both circuit A and B in the schematic...