We'll never know but sounds like boat was thrown backward with rudders turned or even hard over. Sounds like bent rudder posts. No amount of inspection or other pre voyage activity would change that. Carrying an emergency rudder system might have been of benefit but if bent hard over even an emergency set up would not allow meaningful steerage.
?are there any more details known?
The guys over on SA are picking it apart pretty good. But it's still all conjecture. Until Doane writes it up, it will all be guesswork.
In any case, it's a serious black eye for Aero/Alpha.