The consistency that has been a trademark of Catkins' career could also work against the mare in the Coolmore Classic.

Since the middle of last year's Sydney autumn carnival, Catkins has finished no worse than runner-up in 10 starts, winning five times.

And therein lies the reason for trainer Chris Waller's reluctance to declare her a gilt-edged Coolmore chance.

"I'm confident she can win a Group One but whether it is this Saturday under handicap conditions from a wide barrier I'm not sure," Waller said.

Catkins shares Coolmore topweight at 58kg, an impost Waller says is a result of her 10 wins from 19 starts.

"These days horses are handicapped more on ratings and they are being penalised for being more consistent," he said.

Catkins has already been well supported as the $3.40 favourite but Waller will also start Royal Descent ($13) and Arinosa ($21).

As a Group One winner racing on equal terms with Catkins, Waller thinks Royal Descent is a legitimate knockout chance.

"On paper there's not a lot between them and Royal Descent could easily improve up to where's been in the past," he said.

Waller's best result so far in a Coolmore came last year when Red Tracer was beaten on the line by Appearance.