Err... If an article is in a sub-category of a category, should it include both the category and the sub-category or just the sub-category?
For example Warzone is a Cold Element campaign, so it's placed in the Cold Element category, which is a sub-category of user-made campaigns. Should Warzone have both Category:Cold Element and Category:User-made Campaigns, or only Category:Cold Element?
The way I see it, it should be in both, so that it appears in the article listing of the main category. If it's only in one, then it will disappear from the main listing, which is a pointless bother really.