You are one case, and one case cannot be used to infer they are related more than by chance. You need a larger sample in order to do that.
Besides, I just argued the same way as people did here in relation to BD/SM and role playing being related to polyamory. I discarded my own data and concluded nobody had researched the issue, and so nobody really know. OTOH, in my data swinging and polyamory ARE related, but you have already discarded my data as "not usable", so you cannot use that as an argument.
I think the problem is language. You discuss these topics like they are blanket terms.
Poly and swinging can be related
Poly and swinging may not be related
Poly and swinging can be mixed intimately
Poly people can hate swingers
Swingers can hate poly people
BDSM role playing can intertwine with poly
poly people can be vanilla
BDSM people can be swingers
swingers can be into light bdsm
poly people can be into master slave relationships
etc
etc
etc
I identify as a non-monogamous person in an open relationship that is also poly. Currently could be identified as poly fi since I don't have time for anything else. I am an agnostic part time gamer geek jock who tends to sit a little to the canadian right politically.
My wife, as an example, is a christian non-monogamous poly person who is artistic (broadway style) and a hippie
My gf is an agnostic gamer girl geek who is poly and doesn't really touch open swinging with a 10 foot pole. She may lean a little to closed swinging. Artsy (in the art class kind of sense) with strong a strong business management background.
I hope you can see why people keep arguing points with you. Your assertions may be connected some of the time, but are far from a prevailing pattern. All I keep thinking is your subjects must be very specific because, honestly, I haven't met many people that match your descriptors. And I live in a poly strong city. (your pool is also limited to people who would do online surveys, I and my entire pod, do not take part, so we and maybe others like us are eliminated from your stats..)
Your phrasing on pretty much everything you have brought up feels like pigeon holing. It feels like you want to create generic statements that can apply to everyone. It just isn't possible.
I am also a swinger and poly. I have dated poly swinging couples. I know a poly swinging club in calgary. I know a poly swinging group in vancouver. Sex positive groups are all over and don't segregate at all. I also know a poly group that segregates based on gender preference, if you aren't bi, you can't be poly.
I also know swingers who would never consider poly an option. In fact they look at it like some people view bi-sexuality. "oooohhhh I dont think that exists"
Relationship constructs are far from black and white. IRL, I am not seeing the patterns you are identifying, and apparently no one else is either. They do happen, but it isn't a defining pattern. Correlation does not imply causation comes to mind again.