He pleaded guilty to wilful damage but denies six other charges.
They hope to escape without conviction.
Sainey Marong was sentenced to life in prison for her murder in April.
The couple used money for those with intellectual disabilities to fund overseas travel and cigarette purchases.
She claimed commission from the council 13 times for houses she never sold.
Shay Barry Webster pleaded guilty to manslaughter in 2013.
Passenger Jaimey Leigh Fellows was thrown from the car as it barrel-rolled.
Michael Mamea hijacked a car with a man sleeping in it.
Kosmo received a blood transfusion after the attack, which ultimately saved his life.
He pleaded guilty in Christchurch District Court on Thursday.
Police were laying road spikes when he drove at them.
The family of dead teen Chelsea O'Byrne say they forgive the girl.
All five of the companies he involved in the offending are now in liquidation.
He told the Judge it was 'favourite activity' in his rehabilitation process.
The Dance School has been granted name suppression.