Could they be investigating George because Casey has revealed something (a family secret) that could implicate George. If by chance George Anthony is Caylee's biological father, and that is the secret between George and Casey, how much reasonable doubt would that put into whether it was George or Casey that killed Caylee? How embarrassing that would be (if true) to George, and how enraged would Cindy and Lee become if that indeed is the case. The Why Why letter from George to Casey, no DNA test done on George concerning paternity, Casey stating that she hasn't told them anything (what secret was THAT, she was referring to?), George's suicide attempt, his hello beautiful remarks, and naming Casey CEO, sounds so much like he's sucking up to Casey. So, Why the letter to Casey suggesting he is disappointed in something she has said that is harmful to the WHOLE family, including the deceased Caylee. She is throwing him under the bus for sure, he could be the imaginanny and he and Casey could have concocted the script together. George's actions to keep Cindy off HIS trail, by laying everything on Casey. The family is UNITED, the five finger gesture, something tells me George is somehow complicit in either the demise of Caylee or the covering for Casey via the script (under threat of exposure to Cindy), it was probably his duct tape. The defense is looking for reasonable doubt, and their best shot is with George being thrown under the bus. The defense will either use the George is complicit in the demise of Caylee, or mitigate Casey's sentencing by implying that George and Casey had a sexual relationship that may or may not have produced Caylee, and that secret is why the script was created.