A friend of mine told me that he heard the reason they voted Candace out immediately is that she was a last minute replacement.
According to a post I made in the thread for last year's Survivor I was expecting to see Rob Cesternino and RC instead of Colton and Candice, so I believe that if Candice got in because RC dropped out at the last moment.
I've heard similar rumors. I also heard that RC came with her dad, and the reason they dropped out was because her dad was having medical issues related to high blood pressure on the day before filming started.
I also heard that Rob Cesternino was supposed to be there with his wife, but I believe they had to drop out because she got pregnant.