Thank you for the warm welcome [emoji4].
For some reason it keeps coming up that there's an error when I try to post my response, but hopefully this will work. I'm sorry the previous comments that are pertinent to my post aren't quoted, this is due to the error that keeps coming up.
I think sometimes the answer is the most simple. If it was stolen, it could have just been an opportunistic theft. It would not have been the first time something like that has happened.
I am local to the Murrumba Downs area and know DWB fairly well. Personally, I would not leave my car there unattended for fear of it being stolen/broken into.
The purpose of the alternate thief leaving it could be just that, they had their fun with it running it down the highway. It is an extremely noticable car, so they ditched it before their luck ran out.
On another note, there is a double lock up garage at RB's house. Why not stow the mustang there until they knew what to do with it.
However, RB and AD might have indeed ditched the Mustang nearby because RB's girlfriend was due to come home, so perhaps they had to work around her comings and goings also?
I'm not saying that I necessarily believe this is what happened, I am merely offering an alternate angle. I don't know what to believe at this point as this case is so enigmatic.
I also wonder if the same CCTV camera captured the cars at other times on the 7th March? There is only one way in & out of Deep Water Bend by car, so you couldn't avoid the CCTV camera on that house. The only other way would be by boat.
All just opinions and speculation.
I might have a look at DWB on my way home in the morning.