"He's kept improving and what I like most is that while he struggled in the ground across the top, he really loves a fight," Collett said.
"I gave him a dig and he pulled alongside Longchamp and we got there."
The five-year-old will now be aimed at undercard racing on the last two days of the Hawke's Bay carnival, also the next port of call for a brave Longchamp, who gave six kilos to Dolcetto.
Longchamp has been set for the group one Tarzino Trophy on the first day of the meeting on September 2 by Andrew Campbell, who last Thursday confirmed he would be leaving his Opaki base of the last 23 years.
The Group One-winning trainer has purchased a Waikato property and Longchamp will be one of the 14 horses he will be relocating to his new Cambridge base.
Among those heading north will be Gobstopper, an impressive front-running winner of the Liquorland Masterton 2050m.
"He's got ability and I keep saying it, but with time on his side he's strengthened," said Campbell, who guided the early career of his outstanding brother Werther. He was a dual Group Two winner for Campbell and has since added three Group One victories in Hong Kong to his record.