That crossed my mind too, but I always thought that there was insufficient backstage space behind Main Street to hold two parades. Soundsational (afternoon parade) goes from Main Street to IaSW and then PtN goes from IaSW to MS (first time) and then MS to IaSW (second time). So there is only one parade behind MS at any time. I think most folks expected ACF to run in place of Soundsational as the afternoon parade, then both PtN would run in the evening. It'll be interesting to see what happens...