I think it's likely that George has given crucial information to investigators. I don't much care if he's lied to the media and the public--so long as he's given authorities what is needed to convict his daughter.
I am not sure that Cindy is in an emotional state that promotes anything except scrabbling for comfort whereever she can get it, even in "mis-truth." I think all bets are off when it comes to predicting her behavior. At least for a while.
Her self-protective mode may slowly be turned down as she accepts the truth that is being made clearer by the day. When that occurs, I think we may be surprised to find that Cindy is not the monster she is portrayed as being. I think she's a woman who's worked hard all her life to take care of her family. I think she's done the best she knew how. Now she will learn new ways.
I'm not opposed to immunity for the Anthonys. I believe they have found themselves amid horror that no one could possibly anticipate---and as such, there are no blueprints for appropriate response.
With immunity, they can begin to make amends to the universe for the loss of their Caylee--by telling the truth. I am sure there is a good deal more they know, whether related to the crime itself, or simply useful in terms of providing insight into Casey's mind.
I think it would be a shame to squander that information. And I don't see what purpose would be served by prosecuting them. I'm not convinced they obstructed justice---after all, Cindy's the one who called 911. They have been a thorn in Leonard Padilla's and Tim Miller's sides, but they haven't thrown up any real roadblocks. They've simply run their mouths a lot.
Irking WS isn't prison-worthy, IMO.
I have to say that their new attorney is exactly who they needed. It's a shame they were not receptive to what I have to assume was similar guidance from Mark NeJame. But they were unglued at that time. I see two people pulling themselves together--and I am hopeful it's for the right reasons.