In regards to Rubia vs. Kamito, she knew stright up from the beginning she was screwed. Areshia had Terminus Est, and overwhelming ability as a blade dancer.
Rubia had laevantain, who was on the same level as Restia and Est, but the simple power difference between "normal Queen on magic steroids with borrowed skills" and "Ctullu on a drunken power rage" was too high.
The second loss was just Kamito being boss.