What I have read is that a pairing between a pwBPD and one with NPD tends to be dramatic, and less stable and that the more long lasting pairing is with a pwBPD and a partner with enabling/co-dependent traits. That doesn't mean it isn't a difficult relationship but that it tends to last longer.
I think autism isn't addressed as much due to the more recent awareness of high functioning - Level 1 autism. Someone who is more severely on the spectrum, I think would be less likely to pair up with someone due to the social skill demands. However people with higher functioning can maintain relationships, sometimes it takes some effort. I also think they are less likely to be identified due to being able to "mask" or compensate in a social setting.
I can't be certain about any posters but I think I have seen examples of all three on the board- due to the situations they are concerned about. Most don't use a specific label. I think the most common situation is the partner who has been walking on eggshells and is looking for another solution. Many do not believe that the term "co-dependent" fits them but they do say they have been walking on eggshells and compensating for their BPD partner.
Some posters have idenfied as being on the spectrum. I think more information will come out about this pairing. I have wondered if perhaps my father had autistic traits. He eventually also was enabling but I wonder if that was an adaptation to the relationship with my BPD mother. I didn't ever consider he might be somewhat on the spectrum, before the information of high functioning ASD was available. He would not have been indenfied in this time.
He had a "brainy" edge to him and while I saw him as being sociable, but thinking about it, it was mostly with his like minded peers. He didn't share other interests like sports, or other hobbies one thinks of as "with the guys". However, I also think his free time for that was limited as my BPD mother's emotional needs were high and he also took on most of the parenting role at home.
Personally, I think people on the ASD spectrum have unique skills and these may be their focus. Not everyone needs to be very social, and so if that is not their focus, they may not pick up on some red flags, as you described?
BPD mother's skill set was her social savvy and charm, something someone on the spectrum may not be so skilled at. She could be manipulative. I think someone on the spectrum might not pick up on some of these subtle signs when first meeting her. But also not many people did at first, whether or not on the spectrum. I don't believe he had any idea of her issues when they got married, but others on this board didn't see issues at the beginning either.



Your words of encouragement mean more than you know. I really needed to hear that today, it's been a day of grieving. Thank you. 