Hamze crime family boss Bilal Hamze was shot multiple times after walking out of a Japanese restaurant in Sydney's city centre in June 2021 in an apparent retaliation for earlier gang violence.
He suffered wounds to his abdomen, hip and elbow, and later died in hospital.
In her closing address in the NSW Supreme Court murder trial of Samuel John Rokomaqisa, crown prosecutor Kate Ratcliffe conceded unknown men were involved in the ambush.
But she said only Rokomaqisa's whereabouts were relevant to decide the 35-year-old's guilt.
"The accused is guilty whether he was the driver or the shooter," Ms Ratcliffe told jurors on Thursday.
"This trial is not about who could have been or should have been on trial with him."
Rokomaqisa has pleaded not guilty to Hamze's murder as well as conspiring to murder younger brother Ibrahem Hamze and assaulting an elderly man during a carjacking.
It is alleged he committed the crimes to demonstrate his loyalty to the rival Alameddine gang and gain their trust so they would employ him.
But his lawyer has claimed no eyewitness evidence placed the Fijian man inside the black Audi seen to circle the block and pause beside Bilal Hamze when the rounds of shots were fired.
Evidence from people near the scene at the time of the shooting said the windows of the car were "heavily tinted" and the shooter had a mask from the nose to the chin.
The prosecution said their case was based on a combination of multiple pieces of circumstantial evidence in absence of eyewitness confirmation.
Things said by Rokomaqisa after the killing including proving himself with a "job in the city" and expecting large sums of money are enough to prove his involvement beyond reasonable doubt, Ms Ratcliffe said.
Earlier in the trial, a sex worker with Hamze at the time of his execution recalled screaming for help when he was gunned down.
When the woman left Kid Kyoto restaurant with Hamze after dinner on June 17, 2021, she said they were laughing and jovial.
But then she heard a loud bang that prompted Hamze - who she knew as Bill - to start running, so she followed suit.
"I've never heard anything like it. I didn't know what it was," the sex worker said.
She recounted hiding in an alcove until the last of the gunshots rang out before running towards Hamze, who was lying face down on the footpath.
The trial continues.
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