Star Wars movies are built in such a way as to inspire this kind of assumption and creativity in the viewer, and because we are all free to be as creative as we need to be to make sense of some of the things that aren't entirely spelled out in the films themselves, there is a lot of that which will be contradicted as Lucas adds more to "what's what" in the Star Wars universe. Every time he nails something down that contradicts something we assumed, there will be one of two reactions. 1) So I was wrong about that. Interesting. or 2) How dare Lucas not remain consistent to what I had imagined.
Neither reaction is "wrong" or anythying. I just usually choose the former because I can't control what Lucas does, so I made a decision early on to roll along with what he was doing.
Personally I find it more interesting when Lucas surprises me with new things I hadn't considered before.