Now the Rugby Championship is over, England and Ireland will have nearly all the intelligence on the All Blacks they can get.
And they might like what they see.
The All Blacks' kicking game - poor against South Africa in the defeat in Wellington, better against Argentina in Buenos Aires, but not great again against the Boks in Pretoria - is either an area of weakness or potential improvement, depending on one's viewpoint.
Related to this is the evidence that Beauden Barrett, arguably the world's best No 10, is not comfortable under pressure. Few are, but Barrett in particular can be rattled by the sort of rush defence employed by the Boks and before them the British and Irish Lions and even the Crusaders.
It is something recently commented on by Crusaders assistant coach Ronan O'Gara, a former Ireland first-five, who told Irish sporting website The42: "How I always describe it is this – what does an out-half [first-five] love? Two things: space and time. The first thing you've got to do is take that away.