Victor Matfield makes a compelling case that the All Blacks' free-flowing form under Rennie, while genuinely impressive, has been built against opposition defences that simply aren't giving them the same confrontation the Boks will. His specific point is about rush defence — New Zealand's outside backs have been finding space because teams are sitting off them. South Africa won't. Matfield argues the All Blacks will need either a precision kicking game or the ability to go over the top, neither of which they've been seriously stress-tested on yet. John Kirwan, for his part, is bullish in a different direction — he thinks this All Blacks team hasn't even hit its ceiling yet, which makes the upcoming four-Test series genuinely open. Both men agree the series represents a real step up in competition, with Matfield placing South Africa, France, and New Zealand in a tier of their own above the rest of world rugby.