Waller's two other Queensland Oaks runners did come through the Group 2 The Roses, with Chispa finishing second to Fireball Miss, while Soverato was sixth.
It was a drop back in trip for Soverato, a daughter of Vadamos who finished fifth in the Group 1 ATC Oaks.
Chispa will be having the seventh start of her debut campaign this weekend.
Waller doesn't have any doubts about the daughter of Savabeel and the Galileo mare Scintillula handling the step up to 2200 metres in the Oaks.
"She didn't have much luck the other day, but it was good to see her settle well and do all the little things right," he said.
"She should get 2200 metres easily."
The Melhams will each be chasing their first win in the Queensland Oaks, while Maloney is out to make it two wins in three seconds after his shock win aboard the Ciaron Maher-trained Socks Nation in 2024.