"I was very happy after I'd gone 400, 500 metres. He pricked his ears, he was happy just bowling along at his own leisure.
"I probably opened him up a little bit earlier than what I said to the connections before the race, just so that I could get the buffer on the favourite, because I knew he'd be coming somewhere, but this bloke just held his gallop.
"He was challenged and just kept responding."
Newitt said he had to thank Darby Racing for gaining the ride after Hugh Bowman could not make the 55kg the sprinter had in Saturday's race.
"The fortunes of being a lightweight rider," Newitt said.
"I was able to pick him up and yeah, (I'm) just very emotional."
Caballus started his career with Chris Waller before being purchased by Darby Racing as an on-line purchase and transferring to Bjorn Baker.
Luke Hilton, the racing manager for trainer Baker said the decision to geld Caballus was the making of the sprinter.
"Bjorn has done an amazing job with him and Darby (Racing) who picked him up as an on-line purchase," Hilton said.
"He did a good job as a colt, but he wasn't performing to his level, so we gelded him, gave him time and he's gone from strength to strength with each preparation.
"The more Bjorn has been able to work with him, the better he's got and he's really improved over the last six months and he's a Group 1 winner now.
"It's a great achievement by the team."