The upshot is that, as 2012 comes to a close, it becomes apparent that change is constant for the All Blacks even through times of stability and prosperity. They owe their consistent No 1 status to many factors, not the least of which is the evolution of personnel. Change is the inevitable consequence of a world-class production line of talent that keeps developing players who can't be resisted.
There is no comfort zone in All Black rugby and four, maybe five places are still up for grabs in the final two weeks. Aaron Smith, so good all year, has to deliver an accurate, direct and forceful performance against Italy because Piri Weepu was sharp and creative against Scotland.
Brodie Retallick has to match the work-rate of Luke Romano and dominate the lineout, Liam Messam knows Victor Vito is coming to grips with the physical side of test football and that he'll have to confront and dominate a staunch Italian pack and Julian Savea and Hosea Gear are in a head-to-head battle to win the the left wing berth.
"There has been some consistency of selection and I think that has been good and in all probability that is probably what will happen [against Wales]," All Blacks coach Steve Hansen said. "But what we are saying is that we are not going to be frightened to make changes if we think someone is in better form."
That's the All Black way. Nothing ever stands still, no position is taken for granted and slowly teams evolve, and 2012 is no exception.