That comes with a different set of pressures. The responsibility can be a burden as much as it can be invigorating and masterminding a cohesive team performance is not the same as being asked to have a bearing on the shape of a game off the bench.
Rather than talk, Barrett presumably wants to deliver with his actions. If he can play the way he wants, he won't necessarily change the first-five pecking order. But he will provide more assurance to the selectors that he's developing his work to the extent that he's more than capable of replacing Aaron Cruden if required.
"I have played all those games when Beauden has been at No 10," says halfback Aaron Smith. "I always like playing with Beaudy, he's exciting to play with and you always get that feeling something is going to happen.
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"He's not bad at turning a nothing into something and you need that because defences are such a big part of test matches these days that you need guys out there like that."
The hard and fast track at Forsyth Barr Stadium should suit Barrett's running game but he's not likely to overplay his hand in that one facet. He says his intention is: "To play what I see. This time round, it is an opportunity to start but not much changes for me. It is not a lot different to what I have normally prepared for. Any time I get on, I try to make an impact."
Barrett didn't set out to be an impact player. He wants as much game time as possible and knows his best chance of achieving that is to play with the accuracy, cohesion and diversity with which the All Blacks' game plan requires of their first-five.
OPTA FACTS: ALL BLACKS V WALES, THIRD TEST