Most posters appear to have assumed a lineal situation, failure of one engine, partial power on the other from the start which has led, intended or not, to inferences that the guy made a mistake in not landing at Richmond.
There is also the possibility that engine failure was progressive - that at the beginning he had height and distance to play with when he opted for Bankstown. It still could have been that things deteriorated progressively en route after what could have been correct decisions were made, so we should keep an open mind on this guy, who clearly from posts here, was well respected for his culture and skills.