Bruce Lee Ngamu was unharmed, but his brother Joseph Ngamu was shot in the stomach — surviving — and another man who has name suppression was killed.
Defence attorney Shane Cassidy had earlier told jurors Robinson acted alone.
"There was no plan or agreement or understanding, certainly not one that Mr Huriwaka was aware of," he told jurors during opening statements last week, suggesting the grudge theory made little sense when two people unrelated to the police complaint were shot.
"Only Mr Robinson knows why he did what he did," he said.
But Crown prosecutor David Stevens said it was Huriwaka who knew the people at the residence, and Huriwaka who arranged the confrontation.
"It was not a social visit," he said. "The Crown says they are both responsible for what happened when they arrived.
"The defendant was very much a part of what happened that night."
Huriwaka was remanded into custody immediately after jurors were sent home, to await his next court appearance early next month.
"You clearly worked very hard over the last two weeks," Justice van Bohemen told the jurors before dismissing them. "That you have not been able to reach a verdict is no reflection on you."