"Whether Mealamu and Hore play the next World Cup is debatable, not because of ability but because wear-and-tear could get them. Coles has convinced me there is still a conveyor belt of good, mobile hookers out there."
"I think mobility and throwing accuracy almost come first these days when picking a hooker because games can go 20-30 minutes without a scrum. Even props need to be picked on a different skill set as lifters and clean-out men rather than pure scrummaging.
"It doesn't mean you can afford to go into a test with an inferior scrum but fortunately, the All Blacks have Mike Cron as a scrum coach who knows those details in depth."
Nine-test All Black Norm Hewitt loves what Mealamu and Hore offer the All Blacks as a point of difference: "They still do the core duties well; they're in the tight burrowing, stealing and ripping ball. That remains a key role, especially as the game evolves further into a rugby league-style defence with more players in the line and less in contact.
"Mealamu and Hore have got speed too, something the coaches will look for from Coles. In fact it's almost been an evolution across the whole forward pack, looking for more athleticism. Players even wear GPS units to monitor it in training these days. Any way you can refine or enhance someone's performance by a few centimetres or 0.1 of a second, you've got an advantage. We saw that at the World Cup.
"The lineout has also changed. When I started it was simply between you and the jumper, now it comes down to a co-ordinated effort. Hookers need to make adjustments for tired lifters, which could be half a foot as the game progresses. Throwing into that is a skill to be considered."
Hewitt played provincial and international rugby from 1988-2001, when hookers became bulkier to cope with the demands of the scrum.
"They still talked about us being the fourth loose forward. That hasn't changed but when I started we were moving from an era of smaller hookers such as Hika Reid and Andy Dalton into the likes of Australian rake Tommy Lawton. [At around 120kg] he was one of the biggest, toughest scrummagers I played by virtue of sheer size. He wasn't mobile but packing down against him was like hitting one of those D8 Caterpillar bulldozers. Sean Fitzpatrick was a cut above because he could blend both aspects; a good scrummager capable of running with the ball in hand and throwing accurately."