If one was planning a hybrid system, should you consolidate your existing cards (digital and analog) in the lower number shelves (in my case, 4 - 0, 4 - 1, 8 - 0, 8 - 1, and 12 - 0, 12 - 1) ? or does it matter? I'm not clear on how the UCx sees the MG-Xpec gateway and shelf, and card numbering. I'm just trying to do some pre-planning and cleanup prior to making a decision on conversion/upgrade. Thank You!