Jack always promised that if you didn't live together that you'd die alone. I find it very poetic that since they did all stick together, that since they all lived together, they all died together. Jack said "live together, die alone". We always thought that meant "live together, stay alive". It seems that is was actually, "live together, and you won't die alone." They did not die alone. I think that is why they all created the FST, so that they could die together. Christian said in the FST that some had died before Jack and some died long after but they created the place to find each other. I think they did that, and that the writers did that, so that live together die alone, would be true. Ben wasn't quite with all of them in the church, but Ben was never quite with them on the Island. I'm still processing the ending, but I think I love it.