OOD, helmsman, lookouts, CIC, there's lots of blame to go around, and like most accidents there had to be an entire chain of failures for the collision to occur, not just one weak link.
The OOD, JOOD, CIC watch officer are the responsible officers on watch at the time of collision. The helmsman and lookouts are very junior seamen. They will not be held responsible for the collision, unless it can be proven that the disobeyed an order from the OOD or JOOD.