Small Margins. Half a second quicker at the breakdown. A quarter of a second quicker at moving the ball through the hands. A missed tackle in midfield. A marginal referring decision in the final minutes.
Roll them together and the outcome is the most dominant Southern Hemisphere performance in Rugby World Cup History.
Ignore the French game against the All Blacks. That was a combination of previous world cup revenge on the menu [think Cardiff 2007], combined with a huge chasm in quality.
Worry more about Ireland vs Argentina. So strong in the six nations, but utterly outgunned by the new kids on the block in the Rugby Championship. Not even a host of Kiwi coaching staff embedded within six nations coaching units could turn the tide in RWC15.
Northern Hemisphere Teams will need to react quickly if they are to turn it around for Japan 2019. There will be no MacCaw, no Giteau, no Drew Mitchell, no Habana come that tournment. Cue a sigh of relief.
But there will be new world class blood on its way through the Rugby Championship Ranks to replace them. There always is. So don't expect to be sitting too comfortably in four years time.
Perhaps some younger players should be allowed to play in the Super 15 in the interim. A different approach is certainly needed to close down those marginal gains.
Though even with a new generation of budding stars, a succssful Lions tour and a dominant six nations performance, the likes of England will surely need a kinder draw next time.
Imagine the stoney faces if the draw reads: Japan, New Zealand, Tonga, Wales, England. There really are no easy games anymore in modern day Rugby World Cups.