Ok, so Finn's less concerned about the helpless villagers and more concerned about getting revenge. Luckily, the perpetrator's being brought on board right now. Pretty sure they're unarmed now too. Unfortunately, they're also effectively under Kylo's protection, at least for now, so Finn will have some difficulty in actually getting revenge for Gil. I'm going to keep my guess on a 50-50 party split, but Finn's only reason for working with the Rebels will be to get a shot at killing Poe. It'll take some time, but Finn seems like he'll figure out there was only one person shooting at them that had a gun, and that will be that for Poe's anonymity.

In the movie, I do have to wonder what exactly kept Poe from being grouped in with the villagers and being shot. BB-8 seems about as independent as R2-D2, and Poe has no way of knowing where BB ran off to, so there's no immediate reason he wouldn't be cut down like Lor was. Lor would have had a better idea of what the data was than Poe would if obtaining the data was the most important thing to the First Order, and he was killed pretty quickly. Perhaps in the movie, Kylo is planning on letting Poe escape at some point with a couple methods of tracing their movements back to a Rebel base. It'd be similar to how the Millennium Falcon was basically allowed to escape in Episode IV after Leia was rescued. If Poe's actually an ace pilot, then he should be able to fly just about any kind of ship, which would let him take whatever ship's on hand inside to flee.

Of course, that'd only make sense if the First Order is intent on beating the Rebels rather than finding Luke or the mythical world, and I don't have a way to tell how much the campaign matches up with the movie. Sometimes guessing like this feels a bit like planting epileptic tree sprouts and waiting to see if any of the ideas take root.

Oh, and white's not necessarily a sign of being on the good side, mister random trooper; there's lots of different examples of people in white costumes and doing various evil things. Saruman the White, the Dark Elves in Thor 2, the White Witch in the first Narnia book, the Cerberus troops in Mass Effect 3.... Really, it's just easier to link the TV Tropes page for more examples of this and hope the Darths & Droids universe has extra-dimensional internet access.