Michelle Payne said brother Patrick and the entire team would take plenty of satisfaction from the win of their beloved gelding.
"He's just an old marvel," Payne said.
"The whole crew is so excited as you can imagine, and as they should be because he's just an old marvel.
"His win last start put the writing on the wall. He was great under Tom Prebble and brilliant again today.
"Billy did the best he could from the barrier, quite a bit wide, but just had a nice resting run from where he was and balanced him up.
"It was looking a good chance all the way up the straight, but he had to fight for it and just as Jimmy does, he doesn't know how to run a bad race and he fought it out really well.
"I'm sure Patrick's sitting at home with his arms crossed feeling very happy."