Could this be a local teen, say a high school drop out or hs student perhaps hanging at the ball park/playground? They get out of school before the elementary school kids do, right? Maybe she WAS placed in the refuse container at the 1080 Gano house, due to inexperience on the part of the perp, and he got lucky? That 1080 house would be the perfect spot, close to home, if a neighbor teen wanted to go get high or whatever else.
Maybe he lives right there on Gano, maybe he see's 1080 every single day, and knew exactly when the trash comes, so the container was left around back that night while the searches went on. LE found nothing, and then he moved the container out front in such a way that it "blended in" with others from other houses?
Somer was upset, probably looking for a place to hide....see how that could start? Could have gotten her stoned, and then she freaked or something, or he turned super stupid all of a sudden for God only knows what reason?
Who knows.....it just really strikes me that this perp isn't the brightest bulb in the pack, excluding the crime itself naturally. Where's the best place to hide? In plain sight. So if he lives there he's pretty invisible.