He resumed when 10th in the group two Lisa Chittick Foxbridge Plate (1200m) at Te Rapa, then sealed his trip across the Tasman with his win over 1600m at Hastings on September 1.
Dwayne Dunn took over the reins in Saturday's MRC Foundation Cup and was pleased with the five-year-old's effort to finish under two lengths from Night's Watch.
"Dwayne said he was going to improve a lot with the run and we always knew that," O'Sullivan said. "He hadn't run for three weeks but he's flying. He keeps going to the next level.
"You've only got to look at his first three runs last spring compared to his three this time. He needed all those runs and was well beaten.
"He's really grown up with his trip away to Sydney. That's made him."
O'Sullivan was also particularly pleased to see Sir Charles Road show immediate form in Melbourne.
"If he'd been beaten five or six lengths, I'd have said he wasn't up to it, but he proved he's competitive and that was great to see," he said.
"He's pulled up well and now we've just got to wait and see whether he's going to get into the Caulfield Cup. Really it's one race at a time."
Back on the home front, the O'Sullivan-Scott team will be ramping up this weekend, with several runners at Avondale on Saturday.
"We brought them [the spring and summer horses] in later this year and they're coming up nicely," O'Sullivan said. "We'll have quite a few running at Avondale, including Nirvana In Fire, Fortune Patch and Andoyas and maybe Sleeping Beauty if we get some rain."
Nirvana In Fire, a three-year-old son of Showcasing, ended his last campaign with a win at Te Rapa in July after a couple of autumn seconds.
Former Hong Kong galloper Andoyas finished last of nine second-up at Ruakaka after an eye-catching second at Te Rapa and O'Sullivan is prepared to overlook that recent placing.
"It was a better run than it looks on paper. He was beaten only four lengths and was wide," he said. "He's going well."
- NZ Racing Desk
