"We weren't sure if we were able to lead Master Jamie, so we weren't planning to lead," Vale said.
"But when he went four (lengths) in front on the turn I thought he might have let him slide a bit too much, but I've always said to jockeys to not go to the fence unless you're in front with him because he's a horse that loves to be freerolling."
Namazu ($16) won by a 3/4-length margin over the fast-finishing Peter and Paul Snowden-trained Lavish Empire ($21) with Mishani Sniper ($26) a long-head away in third.
The $2.10 favourite Strait Acer finished a length away from the winner in fourth.
Earlier on the card, the Jake Capewell-trained Sir Warwick took out the consolation race – The Fitzroy (1300m) – in a satisfying form turnaround.
Sir Warwick joined Capewell's care about 18 months ago and come to him as a barrier rogue with already having stewards embargo placed on the galloper.
Capewell, who is also the horse breaker engaged by Tony Gollan, chose to start the six-year-old in this event in preference to two races in Brisbane.
Jockey Michael Rodd elaborated on the gelding's quirks.
"It's incredible," Rodd said.
"Before start he wants to jump when the assistant starter says 'all clear'. He's already lunging forward before the button is pressed and gates open."