But halfback is a potential crisis point if injury was to strike Aaron Smith and/or TJ Perenara.
And why else would Hansen hang on to Kerr-Barlow until the end of the year, when he knew from mid-March that under the New Zealand Rugby dictate the player's move to La Rochelle makes him unavailable for Japan?
It just doesn't make sense otherwise.
If the overseas rule is indeed so set in stone, it is foolish. Millions of dollars — money drives much NZR thinking — could rest on who plays in the pivotal positions. Are they really going to base their business around . . . Mitchell Drummond?
The All Black coaches should always have the chance to pick an overseas-based player for the World Cup squad in special circumstances.
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Hansen might also consider another dispensation, to get Toulouse recruit Charlie Faumuina's large frame into the World Cup frame.
If the All Blacks get down to Ofa Tu'ungafasi, they are in trouble.
But halfback is the biggest worry.
The cupboard is so bare there is barely a candidate. With all due respect to Canterbury's Drummond, he played against and for the All Blacks on a wild guess during the northern tour.
It's hard to find anyone who thinks Drummond is definitely good enough to be an All Black.
Even if he was, prep time is fast running out.
Hansen would be crazy to risk the crown on a substandard halfback when he could plead a fine case for someone as good as Kerr-Barlow.
Perhaps Drummond was little more than a fall guy in Europe, there to prove that New Zealand doesn't have a serious third halfback prospect.
It makes you wonder if Hansen has been laying the foundations, forcing the issue, by refusing to give halfbacks he has very little faith in any proper opportunity to win a bit of favour.
Then he will go to NZR boss Steve Tew and say we have no choice.