Latimer has been unliucky not to make the All Blacks and IMO Vant Leven is now probably the 2nd best #8 in NZ now behind Read.
But Cane does have his place in the All Blacks and his game is kinda similar to McCaws. HE visits a high %age of rucks and can make a Huge number of tackles if need be, add the fact he's played test footy and done very well.
Obviously he's being selected for the all blacks over Latimer because of age. And like insurance in case McCaw does not make it to 2015
if you want to bone pick, Cane is also obviously a pet project of Ian Fosters, Foster found cane years ago and had been nurturing him and working to secure him for the chiefs for a long time wouldn't be surprised if that is still going on at test level.
There really is not much between Cane, Braid and Todd in terms of overall ability. They all have slightly different styles and strengths though and that will make the difference.
also easy to forget that Latimer is hardly old... only 27-28 only really a couple years older than Braid/Todd