David Pocock and Sam Warburton are just two of several world - class opensides around at the minute .
McCaw , at 34 now a battle - hardened veteran of 142 caps , is still the world 's leading No 7 .
David Pocock and Sam Warburton are just two of several world - class opensides around at the minute but McCaw , at 34 now a battle - hardened veteran of 142 caps , is still the world 's leading No 7 .