So, a lot of others are saying that only the ones that came with you in 400 Days will be there. I do not think this is true. Perhaps, after they refused to come, Tavia brought others to their camp to force them to come. In this case, it would seem like our 400 Days choices do not matter. Maybe, though, if they came on their own, they are higher ranked and more of an ally to Carver, whereas if they had to come by force, they are more reluctant and will agree to helping with the escape. This scenario would suck for me, as all of mine went with Tavia in my main playthrough.