The same can be said of Perenara. It's not easy playing understudy to Smith, and Perenara has made 19 of his 23 test appearances coming off the bench. At least today he knows Smith won't get on the park, given Hansen has opted to keep him out of the matchday 23 to ensure he's at his yappy, quick-firing best against the Springboks next weekend.
Perenara has been excellent in the last couple of months, helping the Hurricanes to their maiden Super Rugby title and then providing good impact off the bench for the All Blacks. Both of those outcomes looked remote in June when he was left out of the squad for the three-test series against Wales in June.
"I remember the day [All Blacks manager Darren] Shand called me to say I had missed out," Perenara said. "I was gutted. I felt like I had been playing some decent footy through the year. I still have a lot of room to improve but I feel like I am in a good place now."
Some of that came about through a realisation of what changes he needed to make in a black jersey.
"Playing for the Canes and playing for the All Blacks is two different things. In the past when I came into the All Blacks I tried to do the same things as what I had been doing for the Canes, which doesn't work. It's not what the system or game plan needs."
What the All Blacks need out of Squire today is physicality to match the Argentine forwards. It's what Kaino delivers but it's also a strength of Squire's game. It will be a different experience for him today, with all of his three previous tests off the bench.
"I have been quite lucky over the last couple of months to train alongside [Kaino] so I have been getting tips off him," Squire said.
"[Kaino said] just to back yourself and go for it. You don't want to hesitate when you are out there. Just trust yourself and why you are in this team."