Dr Zweli Mkhize, Treasurer-General of the African National Congress, is now the third force in what was meant to be a two candidate succession race between Nkosazana Dlamini Zuma and Cyril Ramaphosa. Can the good doctor saunter through the middle of the field and step onto the podium? First, the physician must heal himself – or, more accurately, everyone in his party. But is there a scalpel in the world sharp enough for such surgery? By RICHARD POPLAK.