Sorry Rainboe, but I was looking for an answer from an Airbus pilot not an english teacher.
The reason we are all thankful to the AAIB for informing us of their findings so quickly, is that naturally we all asumed that it was caused by a maintenance error. The locknuts are not visible on a 320 nosewheel, they are under a plate. Could they have worked loose? Where they fitted correctly? Was it torqued correctly? Was it me? All these questions go through the head of any conciencious engineer that signs the CRS on any aircraft that is involved in an incident.
And to answer your question on hydraulics, no there wouldn't be enough pressure from the EDPs once the engines have been shut down. Neither would there be sufficient airspeed for the RAT to produce adequate hyd power, especially near the end of the landing roll.