I don't follow NZ politics as well as I should - but what was this bloke's end game, assuming all went to plan?
He presents this evidence to the caucus and the rolls Bridges? Then what? This bloke forced us to oust our leader over a relatively minor campaign finance issue (that no one in the party room gives two shits about) and is sitting around recording decidedly off-the-record phone calls. What future does he have in the party? You can't rehabilitate from that point.
Leak the stuff by all means, and deny, deny, deny any allegations that you were the leaker. Sit on the back bench and very quickly time and turnover will give him another chance.
For a politics lifer he seems dumb as a doorpost.