Means: They may not be able to determine the actual cause of death that is true. And they may not be able to provide any direct evidence that shows that KC did the killing.
Opportunity: KC is the last one known to be with Caylee. And the one to have the vehicle in her possession. And the fact that there was evidence that KC was driving around in the vehicle, which evidence proves that Caylee's remains was in will go a very long way in convincing the jury (as well as shocking them.) Just stop and think about that. It smelled so bad that even KC mentioned the smell. And it still smelled when CA and GA picked the car up. That alone puts KC with the remains of her dead daughter. And she didn't report it, and when the car was checked and she had the opportunity to provide an explanation for it, she was unable to do so. To me and IMO to the jury that will be the most convincing evidence. Who doesn't report the death of their child? She knew about the odor, she knew or should have known that her daughter was missing. And she didn't bother to check out the trunk of the vehicle in between her dinners, shopping trips and movies? It puts KC with the remains, and her failure to report it and attempts to hide/explain it shows attempts to coverup.
Then there is the evidence that connects Caylee's remains to the A family home. The tape, the garbage bags and everything. The A's never reported any breakins before that. They never told detectives about any indications that someone had been rummaging in their home. So indications are that the items were removed by someone familiar with the home. So you have KC connected to the dead remains of her daughter. And to the home.
Then there is the heart sticker. That will be a shocker to the jury also. When you look at Caylee's pics, there are hearts everywhere. Hearts on Caylee's items. Who would discard the dead remains of a child, literally dump them like trash in a trash bag, and put a heart sticker on the duct tape? I really think that the sticker might have been gesture of remorse, or a memorial type item like you might put a favorite teddy bear in a casket- but the jury will see it as a type of contempt- just like we saw here the day it came out. But that will shake up the jury and will seal the deal.
Motive: KC's complaints to friends about her mother's relationship to Caylee, the jealousy and the resentment. And the argument/fight that she had with her mother just before she left the home. Add to that the fact that without her mother she didn't have a babysitter- and that that would interfere with her partying. And that her current boyfriend didn't want anything to do with Caylee.
We know a lot about what happened. But we still don't know what all the SA has. Not all has been released yet. And we get it piecemeal, without all the connections and the context that will make it understandable. Yes, I think they have enough to put KC with the dead remains, and to draw a reasonable conclusion that KC was the one who caused the death.
The smoking gun: Not every murder has a smoking gun. Not every murder has a witness. And not every murder has fingerprints and DNA. The biggest challenges in this case is not going to be proving that KC did it. The biggest challenge is going to be proving that it was first degree. And the coverup story that KC came up with is probably going to go a long way in convincing the jury that it was first degree. KC has had many many opportunities to say it was an accident. And she didn't. She didn't when it was first reported that Caylee was missing, she didn't when she was arrested for neglect, she didn't when she was arrested for murder, and she didn't when Caylee's remains were found. Instead she came up with the Zeniada story. The nanny that no one knows, no one has ever seen. Zanny that no one can even prove exists or has ever existed. Even KC didn't recognize the Zeniada that we know about. Why make up that elaborate story if it was an accident?
Yes, I think the SA has much more that they still haven't released, and I believe it is probably the most d*mming evidence. But to me, I think it won't be needed for a conviction. They already have shown more evidence than many other murders that they have gotten convictions for.