Chris Waller reserved the right to change his mind before confirming starts for his George Ryder Stakes quartet on Saturday.

As Rosehill received more rain early on Friday, one Waller-trained horse fell from favour in the weight-for-age race while another from Sydney's all-conquering stable firmed as a clear-cut market leader.

In a reshuffle at the top of betting on the $1 million race, Boban lost favouritism to stablemate and recognised mudlark Red Tracer.

Boban is a genuine query in the expected heavy going on old form but Waller wants to confirm once and for all the Chipping Norton Stakes winner is better on top of the ground.

"My thoughts are that in the George Ryder, all of my horses will run," Waller said.

"But what I'm thinking now doesn't mean to say that is going to happen tomorrow."

The Rosehill track went further into the heavy range after 6mm of rain before an 11.30am inspection on Friday.

It's a rating that can only enhance Red Tracer's chances as the winner of five races from six starts on heavy tracks.

But it has left Boban friendless among early punters and he has drifted from $3.80 to $6.

"He has failed on a slow track but that was when he was a colt and he really wasn't in the same form as he is now," Waller said.

Waller's decision to pay up for Red Tracer could be hailed as one of the masterstrokes of the autumn if she adds the George Ryder to her Group One wins in the Tatt's Tiara and Myer Classic.

Red Tracer was being directed towards the Emancipation Stakes on her way to the Queen of the Turf Stakes.

"When you've got a million-dollar race and she's now one of the favourites, certainly she's got to run," Waller said.

The rain will also help Waller's Doncaster Mile winner Sacred Falls but My Kingdom Of Fife will go around as one of the outsiders.

Australian Turf Club track spokesman Lindsay Murphy said it was unlikely the Rosehill surface would improve.

"It's clearing up to a degree ... but I'm sure we'll be on a heavy track tomorrow," he said.