Trequartista and Lowlife could both be G's imo. Reading back, they were both acting fucking weird as shit. I can't determine which one is the more likely G. Treq on one hand, has been suspicious since the Melo hunt. As for Lowlife, there is no way a citizen would act the way he did. If anything, he makes Fred look suspicious too.
Yeah, I'm not sure who to vote for between those two.