A nice read (actually, it wasn't as I have read WAY too many journal studies and statistics in my life as it is!!) and a lot of information contained therein, but I have to weigh in as I see several holes in this being a key (at least in my sitch).
First off, I'll bore everyone by pointing out that the concept of "personality disorder" is a hotly contested topic in many mental health circles. Noted psychiatrist Dr. William Glasser dismisses the concept and prefers to use the term "personality style." Glasser believes that it is presumptuous to label one type of personality a "disorder" and another as being healthy. The new DSM-5 even does away with Borderline PD and puts it as an Axis I diagnosis in the bi-polar spectrum. In addition to Glasser many other mental health professionals tend to gravitate away from diagnosing someone with a PD since all PDs are Axis II diagnoses and theoretically static and unchanging throughout the life-span. The recent article that was posted relating to how personalities change over time would be in line with the non-acceptance of PD diagnoses.
All that notwithstanding, it doesn't appear that most of our spouses would have exhibited PD symptoms prior to BD. I can think of Hobo/ TB and the many convos he and I have had concerning how his XW's symptoms throughout their relationship are consistent with APD but I am unable to think of more than that. I'm sure there are more, but I confess to not being caught up on all the threads. I can say that although my XW was not a confrontational person (except toward me) but not to the degree that it would be considered any type of "disorder." She was immature, but so am I in many ways (okay, go ahead and agree with me). She functions very well socially and has several friends from work, and was even voted "nicest" and "friendliest" by the other ladies in her office. She was very well-liked by all who knew her, and accepted by my family as one of us. Now, she has different friends at work who don't really seem to have anything in common with her (except for being old maids at least) and treats most of our old friends like crap. Our closest couple friends were here one night when she dropped the kids off and she dissed them like an Israeli would a Pakistani (no offense to anyone). They couldn't believe the way she was and said it was not like her at all. So, if PDs are global and perpetual then how do we explain 180 degree turns? How would that explain the 180s toward the children who they so adored, and how would it explain the upside-down moral compass? It wouldn't. I think the study has merit to it, and as I said it may explain a fractional number of MLCers, but as far as being a reliable explanation for the majority of cases here I have serious doubts. Just my .02.
One day at a time.
Thundarr