Pip Hall QC, representing Sullivan, opened the joint defence submissions this morning with the Latin phrase: "Fraus est odiosa et non praesumenda - fraud is odious and is not to be presumed."
The defence says that is precisely what the Serious Fraud Office and the Crown has done in this case.
"They have presumed fraud when it does not exist," Hall said in opening.
Marc Corlett, counsel for Sullivan, said that on December 7, 2011, the charge was "triumphantly announced" by the Serious Fraud Office as the "biggest fraud in New Zealand's history".
He went on to say that the investigation was the "most resource-intensive and time-consuming in recent history".
"What we know now is very different," Corlett said.
Allegations of the men being involved in the biggest fraud in New Zealand were "baseless and devoid of any merit", the defence argues.
He said the accused were never questioned over SCF's entry into the Crown retail deposit guarantee scheme, without ever been given the chance to explain what had in fact happened back in 2008 and the role that they had played.
"That people can be charged with the biggest fraud in our history without being given the chance to explain is nothing short of mind-boggling," Corlett said.
Another major failing by the SFO and the Crown was that they did not obtain any Treasury or Reserve Bank documents, nor did they interview anyone there before laying charges.
And the failure to interview "the decision-maker" John Whitehead, Secretary to the Treasury, was unfathomable", the defence told the court today.
"Mr Whitehead was not called because wouldn't have provided the evidence the Crown needed," Corlett said.
"Only he knows what factors he took into account in allowing South Canterbury Finance to enter into the scheme.
"Only he knows if the alleged mis-statements would have made a difference."
The long-time SCF chairman, Timaru financier Allan Hubbard, died after a September 2011 car crash, aged 83 - just months after the SFO laid 50 fraud charges against him.
Defence have compiled three volumes of joint submissions, amounting to a "daunting" 572 pages.
Closing arguments for the defence are expected to take the rest of the week.
Justice Paul Heath will then reserve his decision, which is expected to be released in October.