All the evidence needs to be considered together. not separately. The body in the truck with Caylee's hair with banding shows that Caylee's body was in Casey's car.
If Caylee's body was in Casey's car who put her there and why? There is no evidence that anyone in the Anthony family had access to the car or the trunk other than Casey. Therefore the evidence beyond a reasonable doubt indicates that Casey put Caylee's body in the trunk.
If this was an innocent accident why did Casey hide the body in the truck? If George was somehow involved without Casey being blameless why did she lead the converup? IMO neither of these scenarios makes sense.
If it was not an an innocent accident, there are three possibilities: (1) accident due to negligence, (2) intentional attempt to control Caylee through duct tape, chloroform or other means, or (3) premeditated murder. Two or three would lead to first degree murder. one would lead to a lesser charge but not to a not guilty murder.
If this was an accident due to negligence (say she left her in the car but with no intent to actually harm Caylee) why did Casey panic and tried to hide the body? Given Casey's modus operandi it would have been a lot easier for her to lie and claim that she had nothing to do with it than to get involved in an elaborate coverup. IMO the elaborate coverup under this scenario does not make sense. And even if you disagree, this would be criminally negligent manslaughter although not murder.
But even if you believe that she panicked after criminally negligent behavior, I don't believe this fits with the other evidence of the case. For example,
three pieces of duct tape close to the body- one with hair and the mandible tied to the skull are clear evidence that the duct tape was put shortly after Casey's death, consistent with Dr. G. and not Dr. Spitz, or that Kronk somehow did it. You cannot just look at one aspect of the duct tape evidence but at all the aspect of the duct tape evidence. And why would a panicked mother (ore a grandfather for that matter) put duct tape on the dead child? The logical explanation, and this is what circumstantial evidence is all about is that it was done on purpose, hence it was murder. And given the body was in Casey's car, it was Casey and not anyone else who committed that murder. The tape came from the Anthony household and only Casey had access to both the tape and the car.
All the aspects of the duct tape evidence are IMO evidence of felony murder or premeditated murder.
All the other pieces of evidence are consistent with this first degree murder, including Casey's behavior, not just for 31 days but perhaps most crucially for the day of Caylee's death. Is going to Blocbuster's with your boyfriend consistent with a panicked mother who loves her child? IMO, not.
IMO the jury needs to connect the dots.