Aussie kids are in high demand because they are ready to perform on arrival. It's a longitudinal system, the best juniors are nurtured from a young age by the same coaches who are consistently producing the best Open athletes.
Adam Spencer and Sophie O'Sullivan are from Melbourne Track Club. The most dominant squad in Australian middle/long distance history led by Bideau, O'Shaugnessy and Birmingham.
Jackson Sharp emerged from the Run Crew juggernaut. Coaches Howard and St Lawrence, are part of the same family via Sean Williams, who developed Morgan McDonald and Ollie Hoare and many others in the collegiate system.
Ky Robinson was my son's school mate, he trained with Gold Coast Run Co, a group for Recreational runners guided by Jackson Elliott.
In QLD, along with Elliott, there's another 5 Coaches producing multiple NCAA athletes, Chapman, Moore, Russ, Norton and Boltz. Add to that list Didyk in South Australia, Burren and others in Victoria and you'll see why Aussies are prominent in the NCAA.
The Coaches all know what's ahead for the young athletes, and prepare them accordingly. NCAA is one step in the process. When they graduate from college, they return to their development coaches with a hardened edge from competitive racing, and the rise continues.