Dennis certainly is an interesting fellow.
Some slightly molish activities I deduced from his actions during episode 2:
1) choosing to be in a red Bull pinata (Chicago bulls connection?). Also, he avoided having his pinata broken until after the exemption had been released. Supposing the mole knew which pinata had the exemption, would they consider 10,000 out of the pot as enough sabotage? Maybe... then again, seeing Corbin break two of the sticks, maybe he figured he'd break all 3 and that would end the game!
2) Stating that he didn't want an exemption. Yeah, you may want to prove you're smart, but what was up with that?!!
And some rather unmolish behaviour, enough such that I no longer beleive he could be the mole, no matter how many weird clues I can invent that point to him:
His reaction and behaviour during the execution. His leg looked like it was going to twitch him into the atmosphere when he first sat down, and he seemed awful darn excited when he found out he was still alive. And he's probably got the least acting experience out of the bunch.