This is rather silly of me, but I am going to pay devils advocate at the moment.. just to explain why I don't feel this is an open and shut cse.. not because I really believe KC is innocent.
Taking just one piece of evidence like 'odour of decomposition of a human body in car trunk' .. If I were the defense, I would explain that as:
KC ran with a rather lively crowd, and spent time in nightclubs frequented by some notorious people (I dunno about that, but the defense could say it was so, be hard to prove otherwise).. some bad person stowed a body in the trunk of her car..she didn't notice it for awhile, and when things got to the point she did notice it, she found it.. notified some bad ppl she knew... they removed it..
You could do the same sort of thing with every piece of evidence brought out so far. Of course we don't know everything they have, far from it, but lawyers seem to be really creative people when it comes to thinking up alternate explanations for everything. It might defy all common sense, but it 'could' be true. Wherther any jury would buy it is another matter, but juries do some odd things. I think this case is far from won. (sigh)