Sorry, I'm not understanding your reply as it relates to my post. I understand what you typed, but not sure how that addresses the possibility that the middle child could have been killed by the adult female. I'm not stating she was killed in a different place and time than the others, as it was established it was.
I was merely replying to Al Ka's statement: because I had posited such a theory before. It wasn't widely received, as I recall, because the manner in which they were killed was the same, by the same weapon, or something like that.
The reason I had come up with that possibility was because an FBI profiler at one point stated that the crime was an act of sheer hatred (paraphrased) where I saw it as an act of rage. Once we found out about RE, it clicked and I realized where the hate could have come from. I can think of nothing more that could incite hatred in a parent than someone harming his child. So, I suggested the middle child died in the care of the adult female, either deliberately or by accident. This caused him to go into a blind fit of rage and kill the rest, at the same time.
I can't find the original post, it's possibly on one of the other RE threads and got sucked into the black hole when they opened a thread for him and took some of the posts about him to the Allenstown thread, but I'm certain I've posted the about the possibility before.