"For those who compete internationally it makes a lot more sense ... and the 12m [gap] is a lot easier to control.
"At the majority of races now these guys and girls all swim pretty much the same, so it comes down to trying to keep them apart on the bike course."
Several competitors fell foul of the marshals and had to serve time penalties for drafting, including New Zealander Graham O'Grady, a winner of the recent Port of Tauranga half ironman, who finished 23rd today.
Great Britain's Paul Ambrose, who finished fourth behind Australian Christian Kemp and New Zealanders Bevan Docherty and Clark Ellice, was one to raise his frustration about those getting an unfair advantage on the bike leg, which crossed the harbour bridge, took in some of the North Shore, and returned to the Viaduct.
"It's disappointing for a big event like this," he said. "It should be the best man wins."
Ambrose turned out the fastest cycle leg of the day with a 2:09:30 split, more than a minute quicker than the next best, Tasmanian James Hodge.