The delays have in part been caused by legal challenges after a string of blunders by the Crown, including an unlawful search by police and illegal spying by the GCSB.
Mr Davison said the evidence arranged against Dotcom had been taken out of context and cast the wrong light on his business.
The argument turned on the interpretation of the Extradition Act and the extradition treaty with the US. Mr Davison said the law made allowances for the US to produce evidence here backing up the allegations made in its case against the accused.
He said the US needed to show there was a basis for extradition and the allegations had to be backed up by evidence.
Mr Heron said descriptions of Megaupload's practices as a business model were a "lovely euphemism".
In fact, he said, "massive" copyright violation was alleged.
"There is a wealth of evidence summarised."
Mr Heron said the production of evidence should wait until the accused faced trial - and the trial process should not begin in New Zealand.