There were a couple of points that AM clarified on Dr. Phil that have been the subject of some considerable speculation:
He stated the daughters were on a church camping trip. That would seem to indicate that it wasn't something that was planned by BM, but just happened to fall on that weekend. I don't think that rules out premeditation, but does at least answer that question, IMO.
He also stated that the neighbor came over and went into the garage and looked for the cars, which were there (almost sounded like the neighbor either had a key or was given the key code to get into the garage?) It was BM that asked about the bike, and she went back over to check on that.
AM also talked about how BM was committed to the mountain lion story - didn't want to hear that AM wasn't buying it. This, IMO, also seems to indicate that the mountain lion story was the original narrative being pushed by BM. I believe once that wasn't received by anyone, he threw out the abduction theory. I still believe it's possible that the additional article (likely the helmet) that was recovered near the road was placed there by BM or an accomplice after the mountain lion narrative died on the vine (to help "sell" the abduction theory, possibly?) While risky, if they threw it out a car window on Monday evening, I think it fits the timeline - and depending on when it was recovered - might have been possible. It just doesn't make sense as part of a mountain lion narrative - though BM should have realized that was weak to begin with.
MOO, JMO.