No, but I know a bit of Yunas personality.
So as far as her not working for BGC, lets put it this way. Imagine you get into a workplace together with another person as a fresh grad. You even room with them. Then eventually you go off and both start your own companies. Have people working for you. Then you close up your shop and leave. Now imagine going back and working as a subordinate to the person you worked together with in their company. There's gonna be a lot of pride to swallow.
Sure, Yuna never had a problem with swallowing, but I think people should get my point