Just started reading here today and finally caught up. Whew
Like many of you, I don't think Becky ever left that house that morning on her own. I also want to know who else was there, that claimed she did leave because they heard her music turn off and the door slam shut.
For a missing person's case, LE sure is focused heavily on that house and removing a LOT of items (evidence). The drum shaped item made me feel sick. I think, they also don't think she ever left that house on her own.
I have noticed though from all the non-FB pics I've seen of her compared to the FB pics, she really looks nothing like her FB pics. Those are all heavily enhanced (lips, eyebrows) with make-up, where all her other pics she looks much more demure. Not at all uncommon, most teenage girls do that these days. Many adult women do the same thing.