It looks like the defense has no counter to the claim that the hair found in Casey's car trunk belonged to Caylee and had a death band on it. They're not refuting this claim.
I would therefore assume that the defense acknowledges that a deceased Caylee was in the trunk of Casey's car. But, they will likely claim that someone else murdered Caylee and placed her in the trunk of Casey's car.
The car was impounded by the police on July 17, 2008, and at that time Caylee's remains were not in the vehicle. According to prosecution expert witnesses, Caylee's remains were placed at the site on Suburban sometime in June of 2008, at a time when the car was in Casey's possession and control.
It's going to be very difficult for the defense to claim that someone else murdered Caylee and placed her in the trunk of Casey's car, and later removed Caylee's body, at a time when the car was in Casey's possession and control.