"She's around the $15 mark in the market and I think that's where she deserves to be.
"She's happy, she's healthy, she's stayed up there and the run warranted a go at the Oaks."
Busuttin said Proscenium Arch stepped a slowly at Doomben last start which put her back in the race.
While the filly finished the race off strongly, Busuttin said he would prefer Proscenium Arch to be ridden a little closer.
"Initially she was a filly that had been up on speed, but the other day she didn't begin well enough, and she was in an awkward spot, three deep," Busuttin said.
"Then she got flushed out on the corner at Doomben which didn't help things.
"I'd prefer her up on speed, but she was fine ridden back the other day.
"She was one dimensional in the spring, but in saying that her form in the spring was her at her best, but I would say she is running better now than what her form looks on paper.
"She's up there, she's worked well, she's healthy, so she might as well run.
"There are some good fillies in the race, but I'm sure she'll acquit herself well.
"I think she's a top five chance again."