Naturally they don't actually know what power she has. Even if she tells them, a shrewd player will question her truthfulness.
I understand the dislike for Cody and Jess, together they are playing a terrible game. She might have been able to play better without him, but not sure. I like him just for his matter of fact attitude and how he's never seemed impressed with Paul's "celebrity".
Along those lines, as mentioned in an earlier post, I completely dislike the sheep following Paul. If you have watched the show, enough to want to be on it, then you should question everything, and trust nobody completely. Talk to others!
My perfect example of this is from Alex's HOH week:
*Paul goes up to Alex and proposes a nomination plan, and convinces her.
*Paul then goes downstairs and tells others (can't remember who) that Alex has come up with this great plan.
*These others then go up to Alex and say they like this plan.
All it takes is them saying "Paul says you came up with this plan", and her replying "well, Paul is the one that came up with it." Wait a minute, that's not what he said .....