The new scrum laws have made hooker one of rugby's most fluctuating positions in terms of skillset.
Pushing in scrums has increased in proportionate value compared to lineout throwing, ball-carrying and working as a fourth loose forward. South Africa's Bismarck du Plessis is the prototype. The next generation of All Blacks hookers, led by Dane Coles, are the guinea pigs. This morning's Rugby Championship-deciding test at Ellis Park will add a crucial chapter into how the hooker role has evolved.
The theory behind the new laws to create a more stable scrum through better binding is admirable and logical. However, putting the ball in on the referee's command tends to emasculate an attacking team. They surrender a key weapon - timing of the strike. The co-ordination and split-second advantage as the halfback feeds the ball, on the hooker's tap for example, is lost. At present oppositions have what amounts to an eight-versus-seven advantage as the attacking hooker concentrates on striking the ball in the channel rather than pushing.
The effect of the law change is the need for robust, bruising hookers who can stabilise a scrum. Coles may have faced that daunting task this morning as an option to replace Andrew Hore off the bench.
Sympathy for Coles is understandable. He's been picked with a view to developing depth in a position commandeered by Keven Mealamu and Andrew Hore for almost 11 years. Coles is slightly smaller than the incumbents but poised to provide value ball-carrying, lineout-throwing and beavering at the breakdown. Sound the buzzer. If coaches continue recruiting human rocks at hooker , Coles has the potential to have his career stymied.