I don't know if it follows that Gail returned on the 30th because she had agreed to it or was required to. Even if she agreed to return on the 30th, that doesn't mean there weren't other issues. In fact, we know there definitely was one issue: She was so scared she was calling DN and asking LE to meet her at the house. I think a lot of people have been asking why she left so early in the morning, as well. So personally, I don't think this is an issue that has been "cleared up" to use believe09's phrase. I'm not trying to argue. I agree the document gives us insight, but I do not believe it has fully explained anything.
While I know some people think what happened to Gail is neither unusual or sinister, I personally cannot think of any way that everything we have learned could be reasonably explained away to make the situation usual rather than unusual. Just my two cents on this.