The exorcist organizations in the Great Capital of the USA, other than the largest Half Moon Association, also include some smaller groups, which are not much to speak of.
Moreover, if a small exorcist organization grew to a certain size, it would immediately catch the attention of the Half Moon Association, and then be forcibly incorporated.
Therefore, some small exorcist organizations that did not wish to join the Half Moon Association simply controlled their growth, restricting their number of exorcists to 10 or fewer, and their exorcism activities to a certain urban area.
In this way, they could minimize the attention from the Half Moon Association as much as possible.
Because the Half Moon Association controlled many exorcists and its members were scattered, these exorcists of varying ranks would be busy with their own lives and would only come together when there was action to be taken.