I'm bringing this over from the debate thread.
Particularly if she was still alive. There would be $225,000 reasons for someone to come forward. And, LE would be happy to make a sweetheart deal with any informer.
Don't take this as what I think happened, I'm just throwing this out there to see what sticks.
This is way way out there as far as theories goes, btw.
Personally, I honestly have no theory, but since you brought up the reward perhaps it could go this way:
We know the guy offering the reward has ties to the *advertiser censored* industry and other questionable activities. Then in the backwards recordings Casey says something about a guy in *advertiser censored* and boys did this.
What if Casey was somehow involved, maybe did phone sex or something for this guy and had a friend, one she now refers to as "Zenaida", that also "worked" with her and sometimes watched Caylee for her. What if Casey and Zenaida either witnessed a murder, found out about a murder and/or other serious illegal activities, or just somehow involved in that and got in too deep.
Is it plausible that things got seriously screwed up and "Zenaida" and Casey decided to have Zenaida take off with Caylee and go into hiding until things settled down or someone else went to jail and they felt safe again to come home? What if this guy offered this reward just to lull someone into a false sense of security or to get someone to rat out the hiding place?
Now with Caylee and Zenaida off in hiding and Casey in protective custody(I know she's at home, but still protected), Casey can be as smug as she wants to be because she knows she, Caylee and Zenaida all three are safe.
Like I said, I know the reality of this situation is that this is not the way things went down, but since you brought up the reward, this thought popped out.