The thing is, Duala essentially was Athena in terms of her role aboard ship, so one wonders why they didn't just call her that. Perhaps because they saved the weirder character names for pilot callsigns. And of course if she'd been Athena, and thus Apollo's sister, there would've been no romance with Apollo (not that that plot thread worked out very well anyway).
That's true! I did think Dee was Athena in another guise initially and she was developed only slightly more. I think they just teased me with that scene when she dressed down Adama in season one. That's the Dee I wanted to see again! Oh well.