And how much time do you have investigating military accidents?
I would take my 4 Westpacs as authoritative over somebody who investigates how the breech of a 155 exploded.
Or how it was possible a M1A1 ran over a Humvee.
The Fitz had propulsion after the collision, and most certainly before. It was hit at an oblique angle by a cargo vessel, at low speed, on the open seas.
There are no other relevant factors or conditions.