those gears and bearings show distress over time. Not a few seconds. More like several or many minutes.
Sun gear teeth rounded, wear, not sudden fracture.
Already discussed the bearing race of the fractured planet.
LN-OMG showed gearbox capable of pulling out the support plate rather than break apart at conical housing.
Suspension bar theory was likely included by aibn to satisfy AH. While all is preliminary at this point, probably nobody technical in investigation really thinks it's the strut. Only scenario is that lack of strut support put abnormal high loads onto conical housing. Over time the housings develop fatigue fracture and begin to deflect. Misalignment then cause gear and bearing distress. Gearbox gives up the ghost and then.... Problems with that chain of events is you won't get gearing distress until housing fracture. And loads sufficient for that would be evident at support plate as well.
Perhaps more likely it starts with epicyclic.
Did AH fix the earlier problem or just improve the possibility of detection?