The former Super Rugby title winner with the Hurricanes has fitted into coaching so well that he will spend 2023 as backs coach for the Crusaders in Super Rugby Pacific.
Auckland-born Marshall started his rugby career with Tasman, but when missing a place in the Super Rugby structure, in a team or wider training group, he had a chance as a 20-year-old to play in Italy with Zebre.
It proved a stimulating experience in coping with playing a different style of rugby at a different level.
He returned to New Zealand six months later for another three seasons with Tasman before getting a chance in the Hurricanes' wider squad. He had spent four years trying to get a place in the Crusaders.
"I could never crack it as a player but I'm here now as a coach," he said.
"It is surreal to be here now. When I finished rugby, I promised my wife I wouldn't get into coaching. We had moved around so many times during my career, even when I was playing for the Hurricanes moving to Taranaki every six months.
"We worked it out there were well over 20 houses we lived in throughout my career so when I got to the end of it I did say I wouldn't be chasing the coaching dream, and I wouldn't be moving the family around any more."
However, back in Nelson, he got the chance to work with Andrew Goodman and Shane Christie, which gave him coaching work where he had decided to settle.
"Then a couple of years later,, I get a call from Razor [Scott Robertson] and it really throws a spanner in the works for my wife and when I got the opportunity, it was a no brainer. It's such a good opportunity for me to learn and see where coaching can now take me."
He contacted David Havili to see if he felt Marshall could do the job asked of him as backs coach and to see if he would have the backing of the players.
Havili got back in touch to say how much he thought Marshall could add to the environment. He also contacted some of his Hurricanes contacts and admitted being surprised at how supportive they were.
The Crusaders were one of the most successful sides in the sport's history, and looking from the outside while playing, he had always wondered what went on and how they did it.
"It's been impressive. It's a well-run ship. Razor does a great job. Scotty Hansen, the detail he has on the rugby programme. Tamati Ellison, some of his coaching, it's all world-class.
"It's been awesome for me as a young coach to witness these guys at work and try and learn as much as I can off them.
"There's also the players. It's a pretty impressive squad when you look at it on paper and the chance to work with some world-class athletes and try and teach them as much as I can, but also try and learn from them," he said.