Five men initially charged with murder over a teenager's death at an out-of-control western Sydney birthday party have been sentenced for their role in the "cowardly" attack.
Alex Ioane, 18, died after he was kicked in the head and stomped on outside the 16th birthday party held at an Airbnb in Ingleburn in May 2019.
Some of his attackers were part of a group calling themselves "the Claymore Boys", NSW Supreme Court Justice David Davies said.
Mr Ioane had no affiliation and had attended the party with his girlfriend.
He was the victim of behaviour young men fuelled by alcohol, masculine bravado and a group mentality often exhibit, Justice Davies said.
"This wasn't just a punch-up between two equally matched young men."
"It was one person being set upon by a group in a cowardly and vicious fashion," the judge said on Wednesday.
One offender who cannot be named because he was a juvenile when the attack occurred was convicted of manslaughter.
He will be eligible for parole in September 2023 and will continue serving his time in a juvenile facility.
Another charged with affray but already released on bail was given a non-parole period that expired in March.
It was regrettable some of the sentences handed down on Wednesday contained non-parole periods which have already expired, Justice Davies said.
"However, all offenders were being held on remand for murder until the alternative pleas were entered (in July)," he said.
Suliasi Levula Taumalolo, 24, is eligible for parole after his "brief' involvement in the attack on Mr Ioane.
He handed a carton of alcohol he was holding to another person before joining in the attack and was convicted of affray, but eligible for parole since October.
Sione Taulepa Mayol, 25, was the least involved in the affray he was convicted for, Justice Davies said.
Mayol was released on bail in July after serving close to 14 months on remand.
Justice Davies ended his non-parole period on the date Mayol was released and his sentence expires in February 2024.
Mateaki Taumalolo, 22, in custody since September 2020, will be eligible for parole in January.
He had the most serious role of those charged with affray, kicking Mr Ioane as he lay motionless on the ground, Justice Davies said.
"In many respects, there is little to differentiate Mateaki's behaviour from that of (the juvenile convicted of manslaughter), but different pleas have been accepted," Justice Davies said.
His cousin Tafuna Taumalolo, 22, pleaded guilty to murder and was jailed for at least 14 years and one month in November 2021.
He is eligible for parole in June 2033.
