IMHO and premature too , I believe that they will fault the controller to the point of multiple dismissals. They could have and should have prevented this accident.
However (you had to know this was a coming) the actual fault lies completely on the helicopter pilot. As Al’s Helicopter Pilot, you operate in non standard ways a very low altitude making orbits and landings in offsite areas. It is the helicopters job to see and avoid (up to the point of just landing in place for a few moments. Also landing aircraft have the right of way regardless of type. Order of preference is, from the bottom: Rotor, Vertol, fixed, glider, airship, ballon. The lower class ALWAYS gives way to the upper class.
All four of these morons driving missed flashing anti-collision lights at nights and apparently had zero situational awareness. At night, gauging depth (range) is enormously difficult and you should just steer clear of each other by about 5 miles or so. That will put them over one minute away from a collision. Close enough with nonparticipating aircraft.
Flying a helicopter is like having you care in reverse in a parking lot. Even If someone gets hit you, it’s you fault.
IMO the depth perception of the tapes is off as the helicopter can almost never catch a plane. It’s approach speed is probably higher than the helicopters current speed. (The BlackHawk balls to the wall, lightly loaded, in cold weather, can reach the aircraft’s landing speed. What I getting at is the Black Hawk more or less pulled in front of the landing aircraft and was hit by it
I am guessing <with no real facts> that the Hawk pulled in front of a landing aircraft which promptly descended on top of it, into the rotors (ouch ouch ouch)
This tends to reduce the airworthiness of the helicopter to a rock under a frisbee, which it just lost and an then exploding plane (super sonic blade tips into the fuel tanks can set the JP-5 for conversion to heat) possible with a compromised crew compartment (frog in blender, hit pulse: same result)
Probably the only people to possibly survive until impact are in the tail which smacked water as hard as concrete and then sank, drowning them, I hope, while unconscious.
I was an Aviation Safety and Accident Investigator for the US DOD. I know just enough to be very wrong here.
My 2¢ YMMV