Carte Diamond in 2005 was his first starter in Australia, and after an encouraging run in the Caulfield Cup that year, he was injured in a training gallop at Flemington in preparation for the Melbourne Cup.
The stayer returned the following year but was ruled out by RV vets with a tendon injury while in 2007, after missing out on a start in the Melbourne Cup by three spots, Ellison's Bay Story ran in a 2800m race on Cup Day, but sadly broke down and was euthanised.
"You've just got to put your head down and keep cracking on," Ellison said.
"Everybody has bad luck, so anyway, I know I've got a good horse."
"I would say Carte Diamond had adapted but it was just unlucky with him. He had been going into the Melbourne Cup and was absolutely bouncing after the Caulfield Cup and it's just what happens with these horses sometimes.
"But this horse, he's been bouncing."
Williams, who was winning the Geelong Cup for the sixth time on Wednesday, partnered with Dunaden in 2011 when that French-trained galloper went onto to claim the Geelong Cup and Melbourne Cup double.
He gave a glowing report on Onesmoothoperator who carried 54kg on Wednesday and drops to 50kg in the Melbourne Cup before any potential re-handicap.
"I think he's well-placed for this year's race, and that's all you're ever asking for." - Craig Williams
"He's been on a synthetic track, a very firm track today. He's won on soft, and he runs over long distance, and today he's like riding with cotton wool, the way he was.
"Brian Ellison and his team have done a great job. He's a really fit horse, a healthy horse and I think he's only got improvement to come from him."