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WWE has a huge roster so they can just nothing matches all day long. Puro promotions are smaller and you don't want to use up all of your big matches too quickly and you don't want your guys getting hurt if possible so six and ten man matches let the fans see their favorites while the boys don't have to wear themselves out too much. A guy like Naito can just do a couple spots then chill the rest of the time while the jobbers like Bushi do all the work for the small shows.