I decided to go back and compile the power rankings posted in this thread throughout the season and plot the progression of each cast member's average rank after each episode airs. It's hardly scientific, as the sample is small and nowhere near steady (except TexArcher, who posted every week). Also, there was basically no sample for after the first episode, so I started at 2. Anyway, it didn't turn out as interesting as I'd hoped, but here it is anyway:
x-axis is episode, y-axis is average rank after that episode aired