Three men have now died before facing trial Dixon, Rex McIntosh and Richard Galloway.
Of the six men remaining, Ross Browne, Graeme Lindsay and two others with name suppression will go to trial together next year at the High Court in Auckland.
Another man, Alastair Harlow, will go to trial alone next year in the Auckland District Court.
Former assistant principal Ian Robert Wilson was the only man to plead guilty to his charges and was sentenced to three years and seven months in prison in March.