I agree, the ending was a bit of a meh for me. It seemed a little too lucky that Anders isn’t dead (why don’t the cannibals kill him?). And then I felt that if Easter has to be the sacrifice, let him be a real sacrifice; it’s an awful decision for Anders (and Marina) to make and it should feel awful, and unresolved, and a burden. But they seem to get expiation for this sin when we find out the Swenson told Easter’s family that he was dead when he really wasn’t. In other words, it’s not really so bad that he has been returned to his family.
Why not let it be really bad? It could have been a stunning moment of cowardice and capitulation but that’s ruined by all the retconning.