Here are a couple thoughts &/or questions I had in beginning to read through these documents.
1. Does anyone know if the police / phone co. could trace calls "after-the-fact" back in '87, or did they need to have a "tracer" active on the line already (i.e., expecting a suspicious or harassing call)? (ETA: Somewhere in the docs, I later saw reference to "all local calls," so I think they were able to check somehow & could see the calls did not originate outside of the immediate area.)
My guess (which is not a big leap, I know) is that SB made both the "long-distance sounding" call to Family Services (who likely would not have known either LM or SB's voices) and also the call to JB at 11am that she later denied. I suspect she thought the better of that call in midstream & hung up so she could rethink things and tweak her story before proceeding with it. Eleven a.m. is the same time she supposedly laid down for the (2.5 hr.) nap with the help of those muscle relaxers. Did she think those were just a good excuse to explain the long nap? My experience with those is that you're supposed to use them for extreme muscle spasms only.
2. As many are asking, why did JB stay after this kind of abuse? Blood spatter? Beating a child so badly that he soiled himself? Needing to be pulled off of a 6-yr. old child? (ETA: Later in the docs it appeared to say that he was beaten "because" he soiled himself, so I may have misunderstood this the first time I read it.)
Since JB evidently changed his belief that SB was involved in P's disappearance, there are a few thoughts that come to mind. First, that SB "has something on him," as others of you have alluded to. If not that, could it have to do with some extreme form of co-dependence? ("You did this and it's awful, but I can't imagine you going off to prison and leaving me behind!"). The only other idea that occurs to me is that maybe he's really brainwashed by her after-the-fact, and comes to believe whatever crazy story it is she comes up with. It's hard to imagine any parent hanging around under those circumstances. I'm guessing that SB purposely targeted JB due to some vulnerability/inferiority of his that makes him easy for her to control and manipulate. (ETA: And he's a drill sergeant? Sounds to me like she's the one giving the orders @ home.) However, the fact that he failed his polygraph would not support the last idea.
Returning to read some more...