DID is structural dissociation. It basically means mind that is in pieces or parts or what ever term you use about it. But it is well known fact that if you try to fit DID parts to boxes like ANP or EP, boxes might be too small, and you can't make them always fit. And you don't have to. Theory is there to explain things, not define people, same way than diagnoses are just ways to try to describe problems people have. In a way they're not true, they're descriptions. You can not have wrong kind of symptoms, because they don't fit under a dx, but the dx fails to explain everything. Theories too are just that, they're theories, and they don't work 100% of the time, and the fault is not in the patient then.
In haunted self they explain one way how parts with both sides in them can be born.
I can't define parts in our system ANPs or EPs either, they're way too complex to that, and seem to clearly have both sides inside themselves. I mean, we have DID inside DID, and ANP- and EP-parts in that system (Jules' system). It can not be true, if Jules can only be ANP or EP. Theory is not fully ready, because there's still things it can't explain. But structural theory is not a therapy model. It is theory like evolution is a theory, or theory of relativity. We know theory of relativity is not all there is in universe, because there are things it can't explain.