One of Duffie's main attributes is his speed so, providing he can develop his positioning on defence, he shouldn't find the transition too difficult. Having to think, rather than react instinctively, slows the feet and is unacceptable at this level, as Marshall highlighted.
The outlook is also positive for Fisiiahi, another 25-year-old who was a good chance to start on the right wing for the Chiefs against the Crusaders tonight in Christchurch but for a knee problem.
Laumape, 22, is slightly different, and while he got the first opportunity of the trio with a start against the Brumbies in Canberra last night, he did so at second-five, a position which brings with it never-ending questions on defence.
He admitted this week that in his first pre-season match for the Hurricanes he made a tackle and went to run 10m back - a habit from his league days - only to stop when receiving strange looks from his new teammates.
He joined Vince Aso in the midfield for last year's beaten finalists, two men attempting to fill the hole left by Ma'a Nonu and Conrad Smith.
"I don't think anyone could replace Ma'a and Conrad," he said. "The boys who are competing for the midfield spots have to do what's best for the Hurricanes because Ma'a and Conrad are legends of the game."
Early reports on Laumape have been good, however, and if SBW can thrive in the No12 jersey, the former Palmerston North Boys' High School first XV player should be able to quickly find his rhythm.