I've always felt sorry for Lee, regardless of any flip-flopping he may have done. There's a big difference between giving false information to LE (which I don't think he's done) and making statements that are supportive of his family, even Casey.
I honestly don't believe he knows that much and wholeheartedly feel he didn't have anything to do with Caylee's demise or any cover up.
Here he is starting a new family (btw, do we know if his baby has been born?) and his spoiled little sister comes along and pulls the whole family into this mess. Now with the latest DP development he's even being put in a worse place.
If Casey were only to get LWOP or less, Lee would probably have some normalcy restored to his life in a few years after she's been sentenced and the family has adjusted to their "gorgeous daughter" being behind bars but if she does get the DP with the appeals processes and all that comes along with it, his life will be up in the air (as far as his parents' well-being) for decades.
I hope the A's have enough decency as his parents to afford him the luxury of testifying freely and truthfully without fear of facing their wrath if the outcome is negative UNLIKE what seems to be happening to GA.