One more thought: therapists with an ego state approach typically don't discourage the use of parts in the interim -- how could the system function? but rather, want the system to talk amongst themselves, so the parts are looking out for the totality of the person, not just one interest.

Finally, for a highly dissociative person, we do not discourage the use of dissociation in the interim. In fact, we typically work behind the wall of amnesia, if there is one, so the front part can do life while the deep painful work is being done -- vacuuming-- behind the curtain. We don't require the front to own everything - its too overwhelming. Once the traumatic material has been detoxified, THEN we bring the front in on it.