The presence of signicant amounts of wreckage or important parts definitely will be of use in the investigation 's efforts to determine what happened.
There are many ways such wreckage could come to rest as it did...but examination of the pieces and the sequence in which they are positioned along the track of the aircraft will tell the story. Damage to the pieces can also point to a cause.
A very close examination of Blackrock should uncover signs of contact if that is what happened.
Recovery of the CVR and Data Recorder will yield the best account hopefully!