The teacher who coached both Daniel Carter and Colin Slade at Christchurch Boys High School says Slade could end up the better player and eventually force the world's highest test points scorer out of the team.
Talking to Britain's Daily Telegraph newspaper, Stephen Dods, head of sport at Christchurch Boys High, said Slade already did some things better than Carter, and was a "perfectionist". He just lacked the experience.
"Once Colin is settled into a team and a pattern, he's a very intelligent player, almost a perfectionist," Mr Dods told the Telegraph.
"He likes things to be just the way they should be and until they are sorted he can be hesitant. But once he feels part of the system, he never has a bad game."
He said New Zealand might be about to find out just how good Slade was.