Dan Carter hangs up his boots as a study in sporting greatness | Michael Aylwin

‘Best of all time’ discussions are a futile pursuit but no player has greater claim to such a title than the All Blacks legendIn any sport, debates about the greatest of all time are almost constant and, for that reason alone, impossibly tedious – the more so in this age of incontinent social media. It goes without saying such posturing is pointless. Then there is a sport like rugby. Even more pointless. How can you compare winger with prop, lock with scrum-half? How can you compare a relatively brief professional era with the long century or so of amateurism that preceded it?Finally, there is…