Only really able to speculate at the moment, but...
The stabilisers were out which is usually something which is only done when the ship is considered to be on passage rather than normal manoeuvring, so it is likely that if the situation was considered normal then the watertight doors would most likely have been open and what would have been sudden and catastrophic flooding would have meant that compartments would have flooded before the doors were able to be closed.
When a ship like this is manoevring in restricted waters there will normally be either captain or deputy captain on the bridge, chief engineer or deputy chief engineer in the engine control room, all water tight doors closed, extra generators running and some other things which had this been considered a routine passage situation would not have been in place, IMHO if this was not considered to be manoeuvring in restricted waters then that is likely to be seen as the root cause of the accident, but like anything similar there will have been a chain of errors which will have caused it to happen.
They have now confirmed 6 deaths and 16 missing, while the probable loss of 22 lives is dreadful and tragic, more than 99% of those onboard survived, a remarkable figure when you look at what happened.
