I like some of your thinking polyFM...
By being a part of the greater consciousness of humanity I think we inherit some of humanities dysfunctions, and perhaps one could argue that jealousy is one of those things that we inherit to a degree.
But I also believe that mostly we learn it, even as an infant.
I believe that our very core nature is not a jealous one, and so yes, perhaps the journey into poly is a form of shedding learned and inherited social constructs into something more in line with our true nature...
I just wish there was a pill I could take to help me shed the jealous nature - LOL!