I agree that the real Mole is laying low for now. My early fave is the history teacher.
My initial thought is that the Mole has to be clever and probably smart as well so I was looking at their job descriptions. There are 3 jobs that indicate a high degree of intelligence, but the problem with that is the old lady is only listed as retired so we don't know if she used to be a brain surgeon or a lunch lady.
Also the Mole has to be likable and approachable so that they can mislead and fool without drawing suspicion. Based on this I think we can forget about the OBGYN and the utility man being the Mole. Most likely Nichole didn't fuss about being left on the island, because she knew there would be no one sympathetic to her plight and so chose to pretend not to care.
I was at first going to eliminate the old and out of shape, but then realized that I was in Survivor-mode and expected them to be voted out early. Either of these would be a great cover, because failure in the physical tasks would be excusable for those reasons. There are also only 3 contestants in these categories and are my prime suspects for now: The old lady, the fat computer guy and the skinny guy with no stamina although that is most likely just an act.