The broken parts of the planetary gear indicate that a failure in the main gear box was most likely to be the initiating event. The forward suspension bar mounting looks to have failed under a sudden single stress event although there appears to be some signs of minor cracking or corrosion at surface edges. Detailed examination will be needed to check for beach marks to determine positively that this was not a fatigue crack. Pitting and staining of the parts is most likely due to fire and/or immersion in sea water.
The inertia of the main rotor blade would be sufficient to snap the forward mount in event of the main rotor gear box failing suddenly and jamming.
So very reminiscent of the previous rotor detatchment involving G-REDL.