Hmm...
Okay, I'm going to go with instinct on this.
Unvote: ExLight
There is a particular reason why I did this: It's not that I think for an instant that ExLight is not scummy.
It's that, from a Mafia standpoint, ExLight makes a perfect lynch target, either for busing (if ExLight is scum) or mislynching (if ExLight is not).
And, well, let me explain my tactical thinking: If ExLight is Mafia, any Mafia plans automatically exclude ExLight. And, right now, the Mafia have the advantage; they know who they are, but we don't know who we are. Town does not even have any investigative roles confirmed, so Mafia managing to mislynch one of their own only makes us less likely to investigate them when we've got so many others we need information on. So leaving ExLight alive throws a minor monkey wrench into their plans and forces the Mafia to try to readjust.
If ExLight is Town, then it likely means Mafia is taking advantage of the confusion and lack of investigative power to mislynch someone without fear of it bringing instant suspicion; they can just point out how ExLight is acting and say they didn't know he wasn't scum.
But, pretty much, right now the only people with enough information to make power plays are the Mafia. They have the most advantage, and with our lack of investigative roles at the moment the Mafia has the most capacity to plan and make choices to get themselves into a strategic position. If we are going to do anything before we gain the information we need, we need to disrupt Mafia plans and force them to constantly reactively change what they are going to do.