"Brat needed that run and he blew hard after it. He has been jumping out of skin since then. The concern I have is his draw," said Walsh.
Buddy Broke taunted his rivals when he led his heat throughout to score in 44.82s.
Injuries have plagued this genuine stayer's career and he looms as a serious challenger to Thrilling Brat if he adopts that pace-making role again.
"He is excellent and I expect a tad of improvement from him. There is no reason why he can't repeat what he did last Friday tonight," suggested trainer Bill Hodgson.
Osti's Pursuit was gallant when he was crunched late by a neck by Thrilling Brat.
He was having his first attempt at an extreme racing distance here and he is expected to derive natural improvement from that bold outing.
"We were confident he would run out it (755m) okay and he should be better for that effort," said Greg Hore.
Cambridge mentor Arch Lawrence consistently qualifies stayers for Group race finals. In this instance he has three of his stayers lining up.
Little Teegan delivered the race of her career when she flew late for her heat, second to Buddy Broke. Bornarto, as usual used plenty of the track when he wound up a heat third to Thrilling Brat.
And the perennial Group race finalist Mr Chino gamely pressed forward for his heat third to Buddy Broke.
"Little Teegan has a huge staying future in front of her. She has a nice draw [three] from where she can slip along the rail," said Lawrence.
"I expect a better race from Bornarto after his first look down there. His draws suits [seven] from where I expect him to put himself into early contention.
"Mr Chino just keeps on giving everything he has. All three have pulled up extremely good."
The field is completed by the Paul Freeman and Angela Turnwald Foxton-trained Retaliate First and Chill Out Ralph from the Dave and Jean Fahey kennels.
Both will need to take up handier early positions than what they did when delivering their heat fourth placings.
