Now I read another that said the radar images are jacked up because of the altitude, from a seasoned chopper pilot. He also said "Some days just aren't meant for flying." loose quote. I know that area, it's nothing but one canyon after another. Flat ground is a rarity once you leave the valley floor.
I doubt we ever know what truly happened. It sounds like they may never recover all the remains since it hit so hard and fast. Prayers to those affected.