I didn't see Sandra leaving as quitting, but more that she retired. And no matter who wins this and gets a big ol' 2 next to their name, she will always be the first person who did it. People who get their records beaten in sports aren't erased from the books, but are still admired for being someone who set the bar.
I liked when Parvati was listening and talking to Ethan. It was interesting - and very nice - to see her use her personality outside the game play we're usually shown. Maybe some of what has been seen as conniving is just a person who is skilled at connecting with others, kind of like Cirie has done.