It's just that thanks to Belross, people have great expectations for a Chain Game endings... I've been asking people to do it, but most turned me down because they are busy.
If someone wants to do it you could PM me; I think the version I have is the latest. Note, however, that the ending needs to be something special (read: good), bringing everything and everyone together and making some sense of the story. If your only reason for wanting to do an ending is "because no one else would do it", don't PM me!