I have avoided this thread, but thought I would just pop in. After reading some 200 SODDIs, I really don't see one that would work. I entertained the *advertiser censored* theory (post #64), but why return the dead child to KC? Why not lure her to them and kill her too? They could not count on KC keeping it quiet. Then there is the rapist theory (post #82) about the rapist in the area at the time of Caylee's disappearance. I don't see anyone walking up to their garage and witnessing the rape and murder of their child and agreeing to keep quiet about it. Besides, as stated before, there is no evidence this man was ever a pedophile.
The problem for KC is, there is a small window of opportunity for anyone besides KC to have murdered her child. We are talking about 4-6 hours here from the time someone saw KC with Caylee to the time she was photographed at Blockbuster with AL sans Caylee.
There is the trunk evidence, 31 days and the phone call KC supposedly received from Caylee on July 16th. I have always thought that one lie about the phone call will be what seals KC's coffin.
As for SOD, if the defense could come up with one person, just one person from her story about ZFG and prove that they are real, perhaps they may have a shot at a defense. Not only can they not find the ZFG, her sisters, her roommates, her mother, Juliette, Jeff or Zachary, they can't find ANYONE who has ever seen or talked to any of these people.
She is really in a world of hurt for a defense if you ask me, so no, I can't think of any SODI scenario that would fit within those 4-6 hours that Caylee was with KC.