Ask your t to do more research. There's the DID Sourcebook among others... We are as you describe - whoever is best for that event is who comes forward. Sometimes the one who came forward will then reassess the situation and give a directive to another for their specialty. We also switch people frequently through the day. I remember a LONG time ago asking DocJohn about that here - he said it is very very rare and likely not what is actually happening. But we all know how LITTLE is truly known about DIDs. I am trying to teach a local hospital about it (since I'm a former patient) - taking their questions and answering best I can... I got really fed up with the last batch - like they still don't get it (and let's face it, they're not GOING to get it unless they live it, but I'm hoping they'll at least learn some). I was really angry about one question - like they are trying to blame DIDs for not "giving up" their alters to maintain unhealthy behaviors. *oooh that steamed me up*. We are all here for a reason and that is survival. And really, (IMHO) each alter is like any one "regular" person - we each have issues just like anyone else and hang ups and such.... Course, I do think that the MH community also assumes that people who don't just 'get better' or are 'non-treatable' should be able to 'get over it' and if they don't then they're purposely staying sick.
We know more about the ocean depths than we do about the depths of the human mind.
Try to not let it get to you.
Hurrah! You're not a book