If it's coming down at 4" an hour, it'll stick more than that too, honestly. The thing is it won't.
NAM overampedness aside, both seem to pop that follow-up low in a good spot to keep things going after the temps crash to around freezing and the upper levels cooperate. That's the key for anything more than the T-1" of "snow" (outside our best spots) that all the other models are willing to say could happen, I think.