I don’t think the head is missing - you can see the drag dampers still attached. Strange there are no torn blade roots though.
You're right !! On the above pictures, there is no sign of the blades at all, even the rod end of the Damper has torn off taking any part of the blade & that claw fitting with it. Very strange. It's almost like the inner blade root hub has cracked, and failed under high loads in translational flight, letting the blades go, leaving just the inner hub ring where the dampers attach to? A weird one if you just analyse the pictures..........