So are you saying Juno that it's all a coincidence, where Allison was found, the proximity and possible relationship to the scout camp and GBC's association with scouting (both historically and his own personal involvement)?
Just a minor point re: the news - his great grandfather is dead, he can't own the land, so either he used to own it or it has been passed down to someone else in the family,
Of course I'm just speculating, but I just think people tend to overthink things a little. As has been discussed earlier, leaving Brookfield heading away from civilisation would lead you onto Moggill rd, then Mt Crosby rd as Moggill leads back into suburbia at Bellbowrie. If the GBC was in a hurry to get back to his sleeping kids he would be frantically looking for a quick place to unload the body. The stretch before the bridge is the first area where there are no houses nearby and if there was no visible traffic it would be easy to quickly drop the body without having to take time to disguise it. As I also mentioned earlier, I used to live in a property that backs onto the creek a few hundred meters up from the camp and unless it is really pouring with rain, it is more like a gully with a few small waterholes with alot of rocky outcrops and debris. The area at the camp where the creek is accessible is better part of 1km upstream. I honestly don't believe that we have had the sort of rain in the last week that would wash a body that far without getting stuck, just to have it settle on a bank 30m from the river directly below the overpass. Coincidences are everywhere if you look hard enough, but usually the simplest explanation is the most likely one.