James Cummings, trainer of Victoria Derby winner Prized Icon, concedes the New Zealand horses have arrived battle hardened and Baker agrees, describing the NZ Derby as the ideal launch pad.
"It gives you an idea of whether they can stay, and it's become a very tough race in New Zealand since it was shifted from Boxing Day to the start of March [in 2006]," Baker said.
"It means there's more competition. The horses are another couple of months older and a bit stronger."
The benefits of a tough lead-up race was apparent when Gingernuts skipped over the heavy ground to snare the Rosehill Guineas.
Jon Snow then thrived in identical track conditions in the Tulloch Stakes last weekend.
"Obviously it's a lot stronger race this week but we think he's strengthened up, and he doesn't mind wet conditions" Baker said.
Randwick is rated heavy after a wet week in Sydney.
It was pointless to draw a comparison, Baker said, between Jon Snow and his Australian Derby predecessors but the $7.50 third favourite was maturing nicely.
"It's hard, they're racing on different tracks but I think this guy's a good stayer," he said.
Other than Gingernuts, who won the NZ Derby by 2 lengths, Baker nominated second favourite Inference as a major threat.
Co-trainer Michael Hawkes was upbeat about the Randwick Guineas winner after Inference's last-start second to Gingernuts in the Rosehill Guineas on March 18.
"It's an ideal distance for him," he said. "The two Kiwis, they're in with a good chance. They're both great last-start winners but our bloke is on the rise." AAP