The 42-year-old, who currently lives in Bali, shared his honest opinion while chatting to Nova’s Fitzy & Wippa about his fellow celebrity recruits.
As well as applauding NRL star Sam Burgess for his efforts in the wormhole challenge, Koby said that Dual Olympian Jana Pittman blew him away.
“Overall, as a human, I thought that Jana was amazing,” he explained. “She was a single mum of three kids and now she's a doctor.
“She goes hard on everything. She's a really great woman. She's an Olympian and she’s just got really high moral standards for herself and she”s a great mum and she’s got a lot to say that people should listen to.”
The former professional surfer went on to say that Jana would make an incredible leader in Australia as long as she changed one thing.
“As soon as she changes her stances on mandatory vaccines, which is absolute f***ing garbage, as soon as she changes that, she’s our PM that chick, she’s a legend,” he said.
Koby’s admission comes after he was interrogated during Monday night’s episode of SAS Australia about the Bra Boys’ dark history.
He opened up about being charged with perverting the course of justice in 2005 and also spoke about his current lifestyle overseas.
“I live in Bali, I live a really simple life, I try to work as less as I can. I have a beautiful son, a beautiful wife and I’ve never been happier,” he said.
“I want to make them proud and I want to be proud of myself. Every now and then you owe it to yourself to succeed.”
Koby caused controversy early on in the reality show when he was caught cheating during an intense physical challenge.
The recruits were each instructed to do 30 push-ups as part of an assault course, however, he was caught out doing only 15.
Unaware that he was secretly being filmed, he continuously denied any wrongdoing in the challenge when confronted by Chief Instructor Ant Middleton until he was presented with video footage.
“I didn’t mean it, no way. I just wouldn’t have cheated that much,” he began. “But the evidence is there and I’ll take full responsibility.”
Koby is currently one of the ten stars still on the course in the hope of passing SAS selection.
Never miss a thing. Sign up to Yahoo Lifestyle’s daily newsletter.
Or if you have a story idea, email us at firstname.lastname@example.org.