Sargent, who was in her first stage show at the age of 6, and as a schoolgirl got used to travelling the winding road from the east coast to Wellington for dance competitions, will be making her New Zealand debut with the company.
The other New Zealand alumni are Scales, Bradley, and Janessa Dufty.
For Sargent, the audition process was formidable. Two days, where more than 100 dancers were made to perform ballet, contemporary, and improvised routines, with cutbacks after each stage. She was one of two women to be offered a position.
Originally a ballet nut, Sargent only started to really love dancing when she discovered contemporary dance. "It felt more natural and intuitive to me, I feel like a better dancer," she says. "It's exhausting at times, but so rewarding."
Paula Steeds-Huston, head of contemporary dance at the New Zealand School of Dance, says the school is known for turning out strong dancers who can cope with the physical demands of a professional career and adapt to different styles and choreographers.
"Dancers usually come to us at quite a high level, and if they're from Australia they might have done a couple of years already so they are used to how hard we push our dancers - which is extremely hard. Contemporary is a lot more about how you can push your body to the extremes."
Dancers also work with nutritionalists, gym instructors and sports psychologists, she says: "We turn out elite athletes, with very high technique and ability."
The work the Sydney Dance Company will perform in Auckland has won awards for both artistic director Rafael Bonachela and the company, including the 2013 Australian Dance Award for the most outstanding performance.
"2 One Another is undoubtedly glitzy . . . the work is a whole lot more than flashy lights and wide open splits," The Herald-Sun wrote. "It's an organic, multi-dimensional creation, gorgeous to look at and ripe with dramatic tension."
Bradley, who was drawn from his home in rural New South Wales to study at the New Zealand School of Dance, says contemporary dance is a strong vehicle for storytelling.
"It's an expression of what is happening now in our society, between people, between leaders and followers, between money-makers and money-seekers. It aims to set up discussion between people, and it aims to explore. It's not a means by which to impress people, or make people go wow, it's about expression."
Another difference from other dance genres is the way it's devised, Bradley says.
Unlike ballet, contemporary does not have a set language of moves. There are no plies or pirouettes, no positions to master.
Instead, movement is designed to suit the philosophy behind the work. 2 One Another is about human relationships, and how people interact with each other. The dancers spent time in the studio and on the street, watching people's body language. Those small character tics, the subconscious movements people make when talking, were then translated into dance.
"Whenever a contemporary dance move is devised, you set out to create a new vocabulary," Bradley says. "It's completely open."
But does that make it harder to understand?
"Even as someone in the industry, I feel some mild anxiety when I see a show, like I should be trying to read something into it.
"But you shouldn't let that stop you, and if you're not sure what it's about afterwards, that's okay. You don't need to explain it in words, because words restrict us. You just need to have an experience."
2 One Another is at the Aotea Centre from November 13 to 15.