I did some reading and studies in BPD, and what I got out of it (fact or fiction), that BPD alters are facets of a singularity where DID is a true multiplicity. I was just in DBT and I couldn't relate because our behavior patterns changes with whose up front. Since I went the second tme, it just was so not me, so we quit.
Where there is any trauma, I don't doubt any degree of dissociation.