Cochran may be self-aware of his social Geek status, but he is savvy enough that he would have recognized her flirtation for what it was and not taken the bait. Cochran is still playing a controlled game and is always evaluating the others' actions. As he said at tribal, he may be receiving others and knows that people in his alliance may be deceiving him. He recognized Brands and Andrea as the biggest remaining threats and realized that Andrea was the more immediate danger. He got a glimpse of her thinking when she spoke to him about taking Eddie to the end and concluded that she would most likely take Eddie and Erik to the end and win. The logical move was to go with Brenda's plan and neutralize the idol by blindsiding Andrea.

It's hard to tell where things go from here:
Cochran - Dawn is his closest ally/Brenda as the biggest threat
Dawn - emotional, ties to Brenda and Cochran
Brenda - biggest threat and parts of her game are hidden from us
Sherrie - strategy is latch on to the psycho (multiple options)
Erik - thinks he is running the game, has no cohesive strategy
Eddie - glad to still be in the game. Pretty, but clueless

Next week looks over-the-top emotional and we have multiple candidates who could crack under the pressure. It should be a pivotal and will likely be an explosive TC.