There is no manual, no template for international rugby captains and coaches but there is a strong trend with half of the top 10 sides at the World Cup led by loose forwards while another three have forward leaders.
The Wallabies and Pumas are led by hookers and lock Paul O'Connell captains Ireland with the Springboks and Scotland the only teams with backs as captains.
Jean de Villiers in the centre is the nominated Springbok captain while halfback Greig Laidlaw will lead the Scots.
The All Black model in recent years has developed into shared leadership where a senior group of players, spread across multiple positions, work on their areas of expertise to channel into Richie McCaw's captaincy. He once wrote there was no point in trying to be a captain if you were not worth your place in the side.
"Maybe once a century, someone in some sport defies the convention. England once had a cricket captain called Mike Brearley who was not the world's greatest opening bat but who had a mind like Plato. He was a successful leader.