Superceding a queen and swarming are two distinct biological events for bees. Superceding occurs when a hive senses something wrong with a queen and wants to replace her. Typically 1-6 queencells will be started to complete this task, often you find 1-2 cells. How the bees decide on how many cells to make is anyone's guess, but anytime there's more than one queencell I would say swarming is a possibility. I don't know the reason people try to place so much emphasis on location for queencells and their meaning, bees will make cells where they can fit them in. Whenever multiple cells are present a swarm is a possibility, but I don't think it's known why some will swarm multiple times or the first virgin out kills all the other cells which typically happens with a supercedure.