Hm. Luce that is interesting.
IFS, looks at "parts" as not always existing because of trauma as well. The more extreme a part becomes, such as in DID, where the dissociative barrier can be great, is usually resulting because of trauma; BUT parts that all people have can be out of harmony because of relational experiences in childhood, etc.

Here is a link to some idea behind IFS:
http://www.selfleadership.org/node/7285

IFS quoted:
"The IFS Model views a person as containing an ecology of relatively discrete minds, each of which has valuable qualities and each of which is designed for, and wants to play a valuable role. These minds, or parts, are forced out of their valuable roles, however, by life experiences that reorganize the system in unhealthy ways ....What circumstances force these parts into extreme and sometimes destructive roles? Trauma is one factor, but more often it is a person's family of origin values and interactional patterns that create internal polarizations, which escalate over time and are played out in other relationships."

IFS holds that there is a Self that is calm, mindful, and peaceful. By getting your parts in harmony, you free the Self. Schwartz (the creator of IFS) uses an orchestra as example, where something sounds beautiful when everything works together.

It sounds as if this theory of structural dissociation has some elements similar to IFS thinking. It is good to see science moving to better understand the occurrence of DID and dissociation as well as alternative methods for treating.