Hayes said Mr Brightside was technically an 11-time Group 1 winner, courtesy of his All-Star Mile success in 2023, while he also has 12 Group 1 placings and multiple Group 2 victories to his credit.
The training trio had been confident Mr Brightside was in the right form to tackle Saturday's race after his first-up run.
"He paraded beautifully, it was typical Mr B," Hayes said.
"His coat has come on, but the good thing is, he's got improvement to come and we're going to have fun placing him at his next couple of starts."
Although he remains in the Group 1 Cox Plate (2040m) at Moonee Valley on October 25 following first declarations last week, Hayes said the like plan is to keep Mr Brightside at 1600m.
"He's so good over a mile. His mile record is amazing," Hayes said.
"We have to talk about it as he's still in the noms. It's still an option and I'll have to talk to my brothers, Will and J D, and do what we believe is the best result for him.
"The Feehan, we'll definitely consider it. That's probably the next logical race, if not he might have a trial and go to the King Charles III (in Sydney)."