Mr Crosa did not know the area may have been strung earlier and Fulton Hogan denied he had been instructed to complete stringing in the live bay area where he was run over.
Pathologist Dr Fintan Garavan said a limited autopsy was done and a failure to examine the head would not rule out the possibility of a tumour affecting Mr Crosa's hearing or eyesight.
WorkSafe NZ investigated and found no breach of Health and Safety in the Employment Act by Fulton Hogan.
The Crosa family raised concerns there should have been someone supervising in the area and said there were no clear parameters for safe stringing but Dr Bain found no evidence to support this view.
The family's lawyer Genevieve Denize told the court Mr Crosa was "a very methodical and safety conscious individual" who had been attempting to a do a perfect job.
Dr Bain said: "It is the court's view that Mr Crosa was in that bay completing his work task because he thought he was supposed to be there doing it. No fault can be sheeted home to him and at best it is a misunderstanding. The court accepts Fulton Hogan's rule that there is to be no work and the restricting of no stringing, in live plants."
"The Court agrees with Mrs Crosa that her husband would not place himself in a position of extreme danger. We do not know precisely why he was where he was at the time he died, but the court agrees with the family's view that he was 'quite pedantic in the way he organised himself'."
Dr Bain said he did not consider any specific recommendations needed to be made but noted more modern communication technology was now available, and would be used in work places such as this where there was background noise wherever appropriate.
Mr Crosa's widow said: "It is very important that people never forget the husbands and fathers who go off to work to earn a living for their family and never return home. They no longer have a voice but it is vitally important that workplace safety is taken very seriously by everyone, both employers and employees alike."