I happened to have a couple of beers purely by chance with Royden Bergerson after a friends horse recently won a Grp 2 trained by Te Akau. I asked him why didn't Sam go into partnership with him and Royden replied that he told Sam that if he wanted to learn as much as he could in NZ then he was best to sign up at Te Akau.
Not many people realise that Te Akau Stud/Stable employ 120+ people.