Kerr - Barlow , 25 , has cemented the reserve scrum half position .
If Kerr - Barlow enters the fray it 'll be to provide the necessary spark or to ice the game for the All Blacks .
Kerr - Barlow , 25 , has cemented the reserve scrum half position , and if he enters the fray it 'll be to provide the necessary spark or to ice the game for the All Blacks .