Upto the 1995 world cup semi atm (7th chap) - Phil Kingsley Jones (manager) was/is more of a very close friend more-so than a manager and he very much wanted him to stay in rugby union - Phil is a very big rugby union man - but Jonah had played some league as a kid and from the sounds of things even after making the All Blacks still wasnt sure if it was union or league he really wanted to play.
Also ex All Black Eric Rush was a very close friend to him from about the age of 16 till today and Eric wanted him to stay in union also.
It says in the book that he pretty much made his mind up that he would be playing rugby league for the bulldogs - but history is history and he became one of the best union players ever....
I am hooked on it man - only been reading it for a few days and cant put it down at night lol