Let's talk about this one scene where Connor makes this really, really weird expression while talking to Gavin. The breakroom scene earlier in the game has him making really bland, polite expressions, except for the adorable confused face he makes if Gavin walks away without taking the coffee he made (which, rude, why waste coffee?) This, though, this is so curious in that it's so off-kilter. His task is to get rid of Gavin so he can go find the clues to Jericho. He's saying things to try and achieve that goal. But then Gavin threatens him, and there's the snarky bromance line you could go for, but this. This is actually the most interesting bit of this scene. Because just for a split second here, just a blip, he kind of halfway looks like maybe he wants to sneer back at Gavin and give him a piece of his mind in return. It gets shut down really quickly, and he never completes whatever facial expression he's going for before it's overridden, so it ends up just being a really awkward flash of his teeth.
But what I'm getting at is that this is an intriguing glimpse into Connor slowly deviating, a facial indication of that destabilizing software. The social relations protocols can't keep up. Programming says feed Gavin a story that'll get him out of there. Connor-the-person behind the red wall wants to tell Gavin to go die in a fire. There's conflict. It looks weird. He's so close to deviating here, panicked that he can't complete his mission.