You are overthinking the Miller A and Miller B storms. No two storms are alike. Miller A storms are usually good for us, but not always. How they come together is the same in general, but deeper details always different. Miller B storms are usually not good for us as they develop to late for our latitude. Again they come together in similar ways, but details are always different and, this is critical, they only give us a few inches of snow and crush northeast or they completely miss us and crush the northeast. There are exception to both scenarios as has been pointed out by others.