There would be a "relatively complex and sophisticated investigation" into facts, judgments, documents and expert evidence on these matters.
"I think I can say with absolute confidence that the documents themselves are, at the very least, complex," he said.
But Mr Sheppard's Queens Counsel, Bruce Gray, told Justice Mark Cooper that the documents referred to by Mr Miles had been issued to the public. "All were intended to be understandable by the public" Mr Gray said.
Although he conceded the proceedings would have a "business focus" Mr Gray said his client believed the proceedings "in principle should be left to a jury".
"It's a matter affecting the working of markets in New Zealand and members of the investing public should not be excluded," the lawyer said.
Just because juries were used infrequently, particularly with civil cases, it should not create the presumption that they were "incapable of applying themselves," he said.
"It's hard to find raised in the pleadings something so complex that it's outside the ordinary and should be taken away from a jury composed of members of the public," he said.
Also in court yesterday, Mr Miles applied to review a decision from the High Court last year relating to whether pleaded instances of Hotchin and Watson's alleged past "misconduct" could form part of Sheppard's defence.
These instances include Watson being censured in 1998 by the Securities Commission for buying shares in McCollam Print while negotiating its takeover by an entity related to him.
They also include claims Hotchin breached Securities Commission guidelines in 1999 on insider trading in relation to the sale and purchase of shares of a company called Pacific Retail Group.
Mr Miles said these were "a classical example of an irrelevance" and something which were "a side issue" at best.
The hearing continues today.