ok,.. I am going to try to go into a different scenario,.. what if what Casey is saying is true? Her mother was just quoted on Nancy Grace saying that Casey knows who took Caylee and has known her for 3 or 4 years and that she has been betrayed because this person thinks she is doing the right thing. (paraphrasing here) What if someone did take Caylee and they threatened to harm her if Casey went to the police or family members? I know this is completely off the wall but that could be the reason she has been lying.
I really don't believe this is the case but I just thought it and thought I would throw it out there.
I don't think your idea is far-fetched at all, but this family needs to realize that you tell LE the whole story, including names, and let them take it from there. Think about kidnappers..... they always say "Bring the ransom, but don't bring the cops." That's stupid. You tell the cops, and they handle it. If this is really the case, that somebody has threatened Caylee, all the more reason that they need to come clean. jmo