Reed takes some blame too. It wasn't too smart of him to call out Keith and Wes on having an idol. If anyone was going to blow the plan, you'd have to think it would be Keith. The goal should be to have him say as little as possible during tribal.

Reed calls out Keith and Wes in front of the Jury about an idol.
Keith has to be thinking that maybe Reed has flopped to the other side, he did last week.
But that was the entire plan. Reed did exactly what he was suppose to re-affirm the fake plan to split the votes, which was crucial for the real plan to work. Keith should have expected that speach from Reed since it fit their story line.
If Keith had played his part he should have either kept quiet, or when asked by Jeff continue the story by saying "I think Wes or myself are in trouble tonight".
Keith could have even switch the point of conversation by talking about Wes giving up to easily in the challenge, anything but saying "lets stick to the plan" while staring at the one guy in Reed that would sink it.
I don't know if it was editting, but from the edit this was one of the worst verbal trial mistakes I can remember.