All Blacks centre pairing?

When the ABs team to play Tonga was announced i was surprised that SBW paired with Nonu in the centres, especially as it meant moving Nonu - surely the world's best 12 - to 13. However I thought they were fantastic during the game and SBW really showed what he can do.

Before the game i thought that pairing was only selected in order to combat the physicality of the Tongans but could it be a genuine option for the later stages of the cup, or will smith/nonu be reinstated?

I think you would just not not pick Nonunion and Smith rugby fan. They are proven so why tempt fate. Its a good backup to have, and kahui is a really god centre as well.