I'm still thinking it's Dennis. Once again they showed him when they did the "Who is the Mole?" voice over. When they asked each of them if they were the Mole, the other two said the same thing, using the same words and Dennis worded his differently.
Besides, he's such a freak that I don't think he could correctly be figuring out who the Mole is and doing well on the quizzes if it's not him!
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