"He just wants to be the best he can be and that experience over there (at the Crusaders) is the best opportunity to develop on and off the field, to be the best he can be over the next two to three years," Steve Frost told Fox Sports.
"He's going to probably the No 1 rugby franchise, plus club, in the world with a proven track record of developing players to reach the highest potential.
"I don't think we would have got the same opportunity to develop at this point in time in Australia."
Frost is unlikely to feature for the Crusaders anytime soon given the club's depth at lock, but will certainly benefit from learning under All Blacks locking trio Sam Whitelock, Scott Barrett and Luke Romano.
The young lock was a member of the Australian schoolboys side beaten by their New Zealand counterparts in a 34-11 loss last weekend.
Frost's decision to jump ship across the Tasman is another blow for Australian rugby. It follows the resignation of ARU CEO Bill Pulver, the loss of the Western Force under the Super Rugby restructure, and another disappointing year for the Wallabies.