Someone that actually knows what they're talking about will have to fix the error of my assumption in terms of the "not guilty" plea, but...
Casey & JB are setting up their defense as not-guilty-by-reason-of-mental-defect/insanity.
Casey will claim, with an all-star Dr. to back it up, that she has multiple personalities. Casey will claim that ZFG was simply one, if not, THE, other personality in her psyche. They will have to figure out a way to explain why she signed the checks as "Casey" instead of "ZFG" (I assume w/o seeing them), but, this is likely going to be her defense, IMHO.
Whatever happened to Caylee will be her ZFG's-personality's fault, not Casey's.
TADA! :bang: