The cool thing about Aya turning evil is that there's a bit of Azula
creeping into Grey DeLisle's vocal performance.
I have a hard time believing, however, that Aya could be so simpleminded as to think that the way to assess the relative power of love and hate was to stage a physical combat between them. That's kind of a non sequitur, and too stupidly literal-minded for a superintelligence like her.
I wonder how much more we'll see of Carol as Star Sapphire. I imagine she'll be involved in the season finale, but will she return before that?