Personally, I disagree with your take on the normal ending. I think that it was Nester who had done all of those things, and that none of them remembered it. Remember the nurse's thing about repressed memories? It may be that they went through so much shock that they automatically repressed them, and also (MEGA SUPER SPOILERS AHEAD) with the bit at the end where Nester pulls out the knife, is meant to lean towards the fact that it did happen. I do like your take though!