Not necessarily. The defense will create that reasonable doubt on the basis that there is no body (YET). They will carry on with the lie that Caylee was sold to someone who ran off to Puerto Rico or whatever the most current fabrication is at that particular moment. If there is even a SHRED of reasonable doubt in a juror's mind, they cannot vote guilty...
Our only hope for a slam dunk case is that Casey confesses and leads LE to Caylee's body or LE just happens to find Caylee before or during the trial. Highly unlikely, I know, but stranger things have happened...
Reasonable doubt....operative word being "reasonable".....