FIrst, even if the phone's location services showed it had been to Kholo Creek bridge, it is up to the prosecution to show beyond reasonable doubt that it was actually GBC who had it. The location services would only show that the phone had been there, not GBC.
Second, parking in that little parking area near the bridge - which has since been cleared - would still have been relatively easy. And I'm sure someone will correct me if I'm wrong here, but I think the Captiva was a CX model, which IS a 4WD (actually an active All-Wheel Drive). But you could park there even in a 2WD car with no problem.
The spots with potential as having been possible dumping spots have been discussed on here at great length. My favourite is still in that little parking area, reversing up to the little fence or just beyond it where the fence stops, and push the body out of the back of the vehicle down the steep bank of the terminal portion of Little Ugly Creek. From there, she could easily have washed out into Kholo Creek, swirled around on the eddy currents, and "hung up" on the bank where she was found as the flood surge receded. Any further up Little Ugly Creek or Kholo Creek and there are far too many obstacles for my money - fallen trees, big boulders, and bends.
And of course, GBC almost certainly knew that whole area very well from his scouting activities.
OK - I'll get back in my box again now
Nothing much to post due to lack of any new information.