Taylor appeared before the Parole Board at the Otago Corrections Facility last month, seeking early release.
It was noted he had a criminal history, which included serious violence, in Australia dating from 1994 to 2010, as well as subsequent convictions in New Zealand.
His counsel Deborah Henderson stressed her client's frustration that he had undertaken 55 sessions with a private psychologist over three years and "does not know when an end is in sight".
A Corrections psychologist, though, put Taylor in the "moderate" risk category and considered he needed to demonstrate change over an extended period.
A specific rehabilitation programme had been prescribed for the inmate, but he had shunned that in favour of the private clinician, the board heard.
The conflict between the two health professionals' views caused panel convener Judge Geoffrey Ellis some consternation.
He said Taylor's psychologist must document explicitly how the man's risk had been mitigated through their sessions and how it would be managed if he was released.
"At that point, the department has recommended ... that there should be a review by a departmental psychologist of his progress and of his safety plan following completion of treatment," Judge Ellis said.
He said Taylor was "highly intelligent" and was using his time in jail as constructively as possible.
On May 9, 2015, Taylor and Leon Rowles launched a relentless attack on Vincent, knocking him to the floor and stomping on him for more than 90 seconds, continuing even as he lay motionless on the floor.
Taylor delivered 23 single-foot stomps to the victim's head and three times used a bench as leverage so he could use both feet.
In total, about 81 blows were inflicted.
Rowles was jailed for seven years and one month and was granted parole in December 2018.
Taylor will see the board again in October. His sentence expires in 2026.
