On your first question I don't think it was dumb. Unlike some of this cast, Sabrina's objective it to make it to the F3 and put herself in a position to win. By being upfront with Christina, she will use this in hopes of getting her vote (assuming Christina is on the Jury which would be a safe assumption.) She preluded to this when she mentioned in her confessional afterwards that people do remember acts like this later on in the game. I'm sure Troy had the same idea in mind when he approached Jonas giving him a heads-up before he got voted out (hoping to secure Jonas' vote should he make the F3.)

As for your second question...I defintiely have that incorporated in my Summary so I didn't mention it here. I was surpised to hear that but just because one castaway does the LEAST at camp, that's not to say EVERYONE ELSE pulls their weight. There has been mention of Kat not doing much around camp. And although (based on this past RC) it appears Kat does not do the LEAST, I'm not going to assume she does her fair share either.

I also wouldn't make a whole lot of Sabrina being #2. After #1 there's a major dropoff. #2, #3, and #4 are all pretty close to each other on my list this week.