Interesting Video from Airbus showing the exact failure that many of us here zeroed in on from the first photos of the broken pinion. Alarming that blame is cast on handling damage. Spalls move away from dents and get bigger, further away. If it initiated at a dent, it would still be there. This was no dent and they know it. Further, although spalling is the initiating trigger, they neglect to discuss where the fatigue load comes from. The same fatigue load that caused multiple fractures I would suggest, perhaps not coincidentally 90 degrees apart. They probably do not understand the loads but here is another thought: On such a raceway, fatigue damage will very likely initiate sub-surface. the fatigue itself could cause a spall, not just the other way around. Which means propagation toward the teeth may already be underway by the time the spall forms, let alone gets big enough for particle detection. The problem: Both suppliers parts are subject to the load, and thus subject to the failure. Hopefully they guessed at a low enough life to preclude that. But all the same, is this a hope based argument rather than a data driven one? It would be a shame to see a third preventable event, when they should by rule understand the loads.