That's why it's so critical to get all the parts. Investigators evaluate for clues on sequence and time relationship.
Conical housing fracture surfaces may be inconclusive on fatigue evidence due to corrosion from seawater.
Strut should be straight forward. Impact, fatigue, overload, should be preserved enough.
Lab evaluation of gears and bearings will take time but they would already know about heat generated and wear modes. Even if they see fatigue they will still need to find out why. The missing carrier may hold clues about the puzzle.
If AH farmed out the gearbox design as suggested then they may not even have the expertise themselves.
That makes the fast interpretation all the more questionable.