Tandem rotor - with sight of at least three MRB tips and a few metres inboard, showing no obvious signs of damage to the leading edges, would this not indicate very little RPM at impact?
Also the damage to to cabin underside, tail and in particular the skids and cross tubes, indicate to me a very high "G" impact. This would be commensurate with little or no RRPM at impact.
Why no mention of fuel from the outset? Surely the disruption to the belly would have released fuel from the tank system if there was any present.