At Rio Tinto’s 2013 AGM, held in London last week, chairman Jan du Plessis did what none of his predecessors could achieve. Long gone are Rio’s dark knights – notably former Rio Tinto chairmen, Alistair Frame and Robert Wilson – who took such aggressive umbrage at their public detractors. Now, this urbane, immaculately-attired South African has put the grey back into corporate management. And – like it or not – he’s carried many of his staunchest critics with him.