Disorder is defined by a summing of symptoms of the person.
That seems to fit a piecemeal and static theory of the person. The Gestalt theoretical point of view is a holistic and dynamic one. The organization of the life space follows the principle or law towards a 'Good Gestalt' as a general tendency of the self-organization in the psychological field. The combination of the forces in the psychological field establishes a dynamic balance. In this sense both psychic order as well as psychic disorder of a person can be understood as a adaptive and self-organized process of the psychological field including person and environment.