It does seem like some time had to pass from grabbing the pineapple to the hit in the head. It wasn't found in her mouth.
I'm thinking the CBS theory was reckless - the Ramsey's may have a very good case for a lawsuit.
I don't think their theory is much different than others that post here, except maybe the pineapple motive. There is no new evidence. As far as the pineapple in the small intestines, if she had lived for a time after the head injury, it would still be digesting. Burke's interviews with DP have not helped him here.