This is pure conjecture and possibly off-topic, and not my favorite theory. But:
https://www.nbcnews.com/news/us-new...human-traffickers-arrested-across-u-s-n812156
This struck me because it mentioned children, some very, very young, being trafficked.
Also because LE collected various financial records and other documents. On the one hand, stuff could reveal recent purchase of things useful in disposing of a body--indicating premeditation. AND LE could just be fishing for whatever. But the other thing that could be revealed is whether the family, or one family member, could have financial issues that could lead to making further bad choices.
Maybe a scenario could look like being instructed to leave the sleeping child out under the tree to be picked up. Maybe instructions not to notify LE until someone had time to get away. Maybe Dad got cold feet during the waiting period and went out looking but then came back and followed through. ?????
In any case, whatever evidence has been analyzed to start got LE permission for the additional warrants yesterday.
I don't like most of the scenarios. None take us to a good place.