No Game 5 = Game 4 or Bust!
I have it on good authority that, nomatter the result of game 4, all 3 parties have agreed that there will be no game 5 in Sydney.
If Perth wins game 4, then its all over anyway.
If Sydney wins, then the NBL will announce that the series is finished, in a draw, and the Championship will be awarded to the Kings based on ladder position.
Whilst that may sound silly, the real reason is that Perth decided they would not return to Sydney, and will in effect forfeit the last game.
To avoid a backlash, they informed the NBL ahead of time, and the above agreement was reached