He was so good off the bench he was at risk of specialising there - until last year's Super Rugby play-offs. At first five for the Hurricanes, he showed he was a pin-point punter too, controlling a succession of matches that took the Hurricanes to the title and gave Barrett his chance at that pivotal role in the All Blacks.
He took that chance so well he is a certainty to start test matches. His lookalike brother Jordie looks to be on a similar trajectory.
Throughout the team, the rewards of careful development are apparent. This is the year that Sonny Bill Williams should finally establish himself at second five. Outside him, Ryan Crotty has shown Hansen he is a tidy centre in the Conrad Smith mould. Last year's midfield "find", Anton Lienert Brown, can cover both positions from the bench.
If further evidence was needed of the depth of Hansen's talent poll, look at the Maori All Black squad to meet the Lions. With players like Damian McKenzie, James Lowe, Matt Proctor and Nehe Milner Skudder in reserve, other international coaches must weep.
But they know it is not Hansen's good fortune, it is far-sighted selections and management of his players. Under him the All Blacks are a perpetual revelation.