"I was more upbeat after the barrier draw than before it."
Sangster arrived in Sydney last week after showing a return to form with his fighting third behind Guineas rivals Highly Recommended and Ethiopia in the Alister Clark Stakes at Moonee Valley.
It followed two indifferent performances, including a second last to Mosheen in the Australian Guineas.
Busuttin said Sangster struggled to compete at the top level over shorter trips but was buoyed by his last run over 2040m.
The gelding worked strongly with a partner at Randwick on Tuesday morning under Busuttin's watchful eye and he says he will strip much fitter for his Alister Clark effort.
"Danny Nikolic felt he really blew out around the corner at Moonee Valley and had had enough by then, so he stuck on well."
The Victoria Derby winner is one of four New Zealand-trained runners in the Guineas field along with Silent Achiever (drawn 17), Ocean Park (11) and Rock 'n' Pop (10).
Busuttin believes Sangster's best winning chance this autumn will be in the Australian Derby (2400m) at Randwick two weeks from Saturday but he still expects the gelding to make his presence felt at Rosehill.
"I don't think he can win it but I want him running in the first five and I think up to the mile and a half, he will be spot-on in the Derby," he said.
Sangster is a $26 Derby chance with TAB Sportsbet and a $21 chance in the Guineas.
Busuttin hasn't ruled out taking on the older horses at weight-for-age in the The BMW (2400m) at Rosehill in between.
"Realistically, I think the Derby over a mile and a half is our best chance of winning.
"He's in the BMW. If he raced really well on Saturday and it was a bog track for the BMW - he loves the mud and 3-year-olds have a great record in the race - it wouldn't be out of the question him backing up."
- AAP