There were other clues which led me to suspect that this derelict building could be of a place of significance, connected to the disappearance of Maddie, for example, a number of chalked crosses that were marked on a door, the exact number of which matched large stones placed along the side of a recently dug grave / hole in the grounds of the derelict building which gave a view of the churches clock tower...
Whoever dug this grave / hole, would have had sight of the clock on the church tower...
Whoever dug this grave / hole, used a metal bar to create a grave / hole deep enough to place the remains of a small child's body...