You make some good points, Kasha, especially about cozying up to Liz. It's probably too soon for any of them to be thinking that they can answer the quiz thinking "at least I know my friend ____ isn't the Mole, it has to be anyone but him." There's still too many variables. Still, what a coincidence that he was chummy with the two losers two weeks in a row.
If I were the Mole I'd be more likely to be using a Paul strategy than a Bobby strategy. As far as the pig with the exemption (because we can assume the Mole would be given special knowledge to earn an exemption) that would be a tough one to pull off just because there were so many pigs spread everywhere. I'd be more inclined to think it was luck than Mole behavior.
I guess I can see his actions being explained either way - like most of these guys!