I think they would like to take back the things that are protecting Casey. They said and did things to help her look innocent because they thoughjt she was. But now that the bus is chasing them around at full speed, they are locked into those statements.
They denied the family fight on the 15th because it made Casey look bad. But now they cannot testify to it and it would help the state with MOTIVE, imo.
And I think George lied about seeing Caylee on the 16th, to help save Casey. Now she is accusing him of rape and incest so I think he wishes he could take that back.
If he could say that she was attacked by Cindy, threatened with a legal battle over Caylee, and so she stomped angrily out of the house, with Caylee in the middle of the night, and he never saw the baby again-----GUILTY VERDICT, imo/