This sounds about right. I do wonder if E was the in bathroom and that was when X stated to him that someone was in the house. It seems like she would have had to state it either to herself (in the kitchen) maybe hoping that D would hear, or, to E.
If E was with her, there would likely have been a response (from him), or maybe they would have left the house together, or knocked on D's door. That didn't happen.
So, maybe E was in the bathroom, X mentions someone being in the house loudly enough for him to hear & heads back to her room. We don't know if she locked her door or not. It's possible that BK was already in the room. If she was murdered right then, E might have come from the bathroom, said to her that he would help and was then killed by BK who was lurking nearby. That bedroom is so small, I don't remember if there is even a closet in there.
Or, when X returned to her room E was already deceased, BK grabs her when she enters, covers her mouth and says a creepy line about being there to help before killing her.
I am guessing that if BK entered the room and E & X were both awake and in bed, there would have been a lot more noise and screaming, yelling etc..
It's all disturbing and I feel like 1 or more of the women was an intended target, not all 4 people, especially at once. I do think he stalked them for months with the intent of drawing this out, he was enjoying having control over when he might actually interact with them.
I haven't really been on here since the summer of the Watts case. I've seen a few other posters who returned due to this case. I'm saying hello!