Brian O'Driscoll is back on a familiar theme — arguing that Nienaber's defensive system at Leinster is creating a continuity problem for Ireland's national setup. The implication is that players drilled in Nienaber's structures are arriving at international camp with habits that don't translate cleanly into Andy Farrell's system. For Bok fans it's an interesting lens: the same defensive architect who defined South Africa's World Cup-winning era is now, according to BOD at least, causing headaches in a different rugby environment.