I was under the impression that it would be a transit to end just that we're not taking the transit.
Also we don't need to use MEL as a stop mid trip. Its just there if we can use it for free SC. Could easily stop at SYD and make our way to MEL on any flight.
Edit: Oh you're right the last leg if we don't transit to jakarta is considered a stop. Hmm ill play around with it a bit more.
Could i transit in SYD twice and also do a stopover there?