Completely my opinion.
I think PB was seen at IGA with JW and TB where there was some sort of an argument. This could have been seen on CCTV or a witness. JW did admit to being at the IGA that morning. The argument continued on the drive and PB tried to call her boyfriend for help (maybe even discretely). When they noticed they took the phone and switched it off. I think the gun under the front seat was pulled during the argument (JW saying TB passed makeup bag to backseat and was really pointing the gun) and when they got close to the airport TB and JW freaked out that PB would report them once inside the terminal. This could be why they got so close. After that somewhere between BMX track and GNS PB was killed.
MOO
Your hypothetical does sound plausible.
- JW reported buying energy drinks at the IGA before leaving for the airport
- Pheobe was last confirmed alive in CCTV prior to the car reaching the BMX track near the Airport
- There isn't much else in terms of shops or businesses between Gin Gin and the Airport where she'd have a reason to be out of the car, and obviously could be confirmed to be alive on CCTV.
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