Obviously I'm in the minority, but the more detail that comes out about the disposal of the body, the more it looks like a different perp to me, rather than KCA. If KC were the perpetrator I can't see any way that she would dispose of the body with the duct tape still on, she would remove the tape to lessen the appearance of cruelty/keep the accident option open, and anyway, there's no way I see her depositing the body right there next to the street around the corner from her home. To me, it really looks like a perpetrator who either wanted the body to be found and the murder connected to KCA, or who didn't care if the body was found. I think KC would do everything possible to stay out of prison, she would definitely put the body anywhere else, Orlando is full of woods/foliage off the side of roads and ponds and lakes all over town. She could easily dispose of the body in a million places where it might never be found. The reports of the heart sticker over the taped mouth, likewise, to me it seems like a mocking kind of display, like it was meant to be seen, it seems like maybe a pedophile or like someone committing the crime as a retribution or anger crime against KCA or someone in her family. The heart symbol could even be a calling card of some kind. My opinion only
I can't rule KCA out, but I'm still not totally convinced. (And anyone who could get hold of Caylee could get hold of other items that might be along with her.)