I'm unclear as to what you are trying to figure out. Could you explain what it is behind this that makes you interested in knowing? If you read around here long enough you will see that there are many configurations in poly relationship dynamics.
All four of us for about three years. We are not all partnered but metamour relationships I find are just as important. Often there is no less support and caring. To me poly is about creating relationships of care and support. The rest is icing. I have a lot of icing
I'm very fortunate.