I suspect most of the players are still trying to identify and eliminate traitors though: they do seem genuinely surprised/disappointed when a faithful is banished. It is quite scary how they latch onto tiny things and become convinced. I suspect that as soon as the faithful feel they are being targeted, they feel pressured and act in ways that reinforce everybody's ideas about them. Defensiveness gets interpreted as guilt very easily.
It's really hard to know whether this transfers to the jury system. It's hard for there to be an open discussions about how decisions get made by juries because people obviously can't talk about their experiences. To me juries feel like the 'least worst' way to make such decisions and you do need to be unanimous or extremely close to unanimous if the judge gives permission for that.
I wondered about the order of entry at breakfast too, but I've read that they film the scene in multiple permutations so they can't just figure it out from that. I don't know if that is accurate that film different permutations, but I find it hard to believe that nobody has cottoned on to the idea that the last couple of people in are faithful.