Lockwood is aiming at back-to-back wins with Invincible Gangsta in Saturday's BRC Membership Open Handicap (1000m) at Eagle Farm.
Invincible Gangsta was a handy performer for Buchanan who is based at Wyong in NSW.
She decided Invincible Gangsta would be better suited in Brisbane than Sydney.
Eagle Farm-based Lockwood took over training of the gelding for this campaign and Invincible Gangsta has recorded a second at the Sunshine Coast and a win at Eagle Farm.
“He dropped a lot in weight from the Sunshine Coast to Eagle Farm. But the key was he was well drawn so he could race handy with cover,” Lockwood said.
“It could be the key again on Saturday because he has drawn barrier two. There looks to be pace so he should get into a good position early.”
Lockwood said Buchanan had been confident Invincible Gangsta could win multiple races in Brisbane.
“She is a good judge so let's hope Invincible Gangsta can continue to prove it,” he said.
Lockwood is considering scratching his other runner, Adoradancer, from the race after she drew the outside barrier.