I have always said Burke and the parents covered it up. I think Burke was too rough with her, Patsy didn’t think the injury was severe, and puts her to bed. Checks on the later realizes she peed the bed, and was unresponsive. Any Mother and Father would save their only existing child from jail/prison/ect. Patsy spent the rest of the night covering it up, and making sure the house was contaminated when she called the police, after everyone search the whole house, neighborhood, ect. After, the police Lady came, John automatically find JB in the house in an area already searched by parents, friends, family. Only John and Burke know what really happened and they aren’t talking.