I hear what you are saying Jim. I was thinking further about this. I suspect if the pump pumped so little that it all bypassed the radiator, then the car would not cool down when idling. Yet that's not true, at the lowest flow point, the car can still shed heat when the fans turn on at idle.
FYI, while hardly definitive, I had a quick write-up in HotB issue 15 if you want to give it a quick read.