There is obvious disappointment in Purdon's voice as while he also trains NZ's top rated three-year-old trotter in Enhance Your Calm, he has a soft spot for Oscar Bonevena, who could be every bit as good as his stablemate.
Purdon purchased the then juvenile last season from Phil Williamson for former Kiwi trainer now based in the US, Chris Ryder, and Purdon's own father, training legend Roy Purdon.
While he galloped at the Jewels, Oscar Bonevena reminded everybody how good he was with a fresh-up win at Alexandra Park in December which was followed by an enormous second there on New Year's Eve when he trotted 3:26.2 for the 2700m, a full second inside Heavyweight Hero's three-year-old national record.
"That was a huge run that day and he is a very good horse in the making so it is very disappointing to have this sort of problem with him," said Purdon.
With Oscar Bonevena sidelined indefinitely, Enhance Your Calm will be the stable flagbearer in the major three-year-old trots.
The first of those is the NZ Derby on April 5 and he will have a lead-up in the Sires' Stakes prelude there on Friday week, a race which has been rescheduled from last Friday's cancelled Addington meeting.
"He is going very well and would be as good as any three-year-old I have had at this stage of the season," Purdon said.
After the NZ Derby, Enhance Your Calm will head to Auckland for the Sires' Stakes and Northern Trot Derby before rounding out his season in the Jewels.
"I think that will do him, we probably wouldn't go to Victoria with him."
Meanwhile, harness punters at tonight's Cambridge meeting have a rare treat with a $100,000 Pick6 to chase, albeit not an easy challenge.