Donal Lenihan: South Africa's strategy is obvious. Can Ireland negate it?

ALL SET: Ireland's Johnny Sexton during the captain's run at the Stade de France in Paris, France. Pic: Gareth Fuller/PA Wire
From the moment Rassie Erasmus and Jacques Nienaber launched their 7-1 bench initiative against New Zealand in Twickenham last month, I couldn’t help but think it was trialled specifically with Saturday's World Cup pool tie against Ireland in mind.