I think it is possible that something happened during the fight between Cindy and Casey to Caylee. I do not think Caylee ever left the A fam house alive and the cover up began then with the kidnap story, imo. So yes...I can "seriously opine" that Cindy was possibly involved in the death of this child.
Someone should have seen Caylee the next day. A neighbor while they were getting into the car. Someone at a stoplight. Someone along the route taken that day. Anyone that could place her anywhere besides the home with anyone else. Hasn't happened and it is not going to happen because no one did.
So you have to ask, "If not, why not?".
Anytime you have a missing person, it is SOP to go back to the last person known to have been seen with the person alive. You start there looking at viable suspects. Cindy has not been cleared and neither has George. LE has only said they are not "looking at them as suspects". Doesn't mean squat, imo.
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I tend to think that KC may have said something like "I'd rather see her dead than for you to have custody" or something along those lines. Or maybe along the lines of "if you file for custody I'll ?????(leave with her, give her away??) and you'll never see her again". I think that's why CA was so worried about Caylee while KC was gone for that month. I also think it goes along with CA saying "What have you done?" I don't think that the A's truly believe that Zani has her, but I think they feel there is a very slight possibility that KC sent her someplace or gave her to someone else to teach them a lesson. When CA called the police and set all of this into motion, they think KC was still mad enough to let them stew; especially since KC believes that she will get off, simply because she always has. Maybe they believe that she is cruel enough to carry this all the way to the end? That would explain the suck up attitude in the visitation tapes--I believe they know the decomp was Caylee, but if there is even a minute hope of her being alive, they will believe that. I just can't believe they could be dumb enough to ignore the evidence without something in KC's past that would make them believe something else. I always wonder about LA asking KC, "Is this like last time?" Maybe she has pulled something like this before??