Eric B in this thread: second to last post.
I have to admit that I've been pretty lost at times as to how these things work and fit together, since the real world is full of so many possibilities that happen all at the same time. And then I try to remember that theories or models are just lenses that we use to view the world in a certain categorization structure so that we can come to a focused understanding about certain specific phenomena. Within language study, we could view something through a Cognitive lens and get a certain interpretation from data, or we could view it through a Sociocultural lens and get entirely different interpretations using the same data. Optimality Theory is just another one of these lenses, and to be honest I'm not quite certain (in fact highly doubtful) of its applicability to spheres other than language. So, I guess you're saying we need to be careful to choose the appropriate lens to get the focus that we need for what we're looking at, perhaps?
I also have to admit that I haven't heard much about Ji, Je, Pi, and Pe either. I suppose I should look more into that.
Without lenses of theory, I've always tended to think of personality as a sort of three-dimensional dynamic continuum spectrum thing, complete with various shades of colours. And I've always thought that every person had every shade and colour as a possibility. It's just that people tended to have a general 'comfort zone' of where they tended to stay. Sometimes they could edge closer to the edge of that zone, and sometimes even move out of that zone.
However, without using the appropriate theoretical lenses, it's easy to get lost and off down the wrong path. It was something that I had done, and probably will do again. The great thing about being mistaken, though, is that perhaps you can better understand things, I think.