Not about to get embroiled in an A-vs.-B match (I have personal opinions and they'll stay that way), I do wonder if Southern Africa and South America ops direct Sydney figure at all? At 207 min ETOPS, the Great Circle mapper indicates that more than two engines would be required.
(hope this link works
http://gc.kls2.com/cgi-bin/gc?PATH=Y...YLE=&ETOPS=207