qwerty - McCaw tops the tackle count for the ABs in almost every test he plays. He is still far more prominent at the breakdown than Cane. AS long as McCaw has one good foot he is still very much in the top 2-3 players for the ABs. But not that an Aussie sees that....
As for Carter, he may not have the running game that Barrett has now but he is far more reliable defensively and as a goal kicker. Plus Barrett is the perfect bench man because he can cover 10 and fullback. The strategy for the ABs is that barring injury Barrett will come on at fullback with 20-25 to go and Ben Smith goes to the wing.