I believe George is covering something up. Thats the issue, George offers reasonable doubt.
Don't you think that a LE official would know how to take care of a body so that nobody would find it? That he'd bury it deep and bury it far away from the family's house. That he'd cover any tracks and would make sure his daughter would have an airtight story? Something more on the lines that Caylee wandered off (the gate was open according to Cindy) and hasn't been seen since?
Do you think that a LE would tell his daughter to make up a nanny that didn't exist? Especially when he knows the police would do a search for this nanny? And would a LE have her change her story to accidental drowning once the body was found?
Don't you think that he'd make sure that body never turned up so it looked like an unsolved crime?
Sorry, but if GA were involved, I'm thinking he'd have done a better job of hiding that body and coming up with alabis.