I get what you’re trying to say. Parents, especially mothers, who murder their children will sometimes wrap them in a blanket before they’re discarded like trash. As Lori isn’t capable of loving or caring for anyone but herself, it’s my feeling the wrapping of JJ was done for practical reasons. Perhaps to make the body as compact as possible so he would easily fit inside a trash bag. If they truly believe the zombie nonsense, perhaps the duct tape was used for some stupid reason to do with zombies. I’m pretty sure Chad knew it was all rubbish he dreamed up or co-opted from another source. I change my mind almost daily on whether Lori truly believed it or simply found it convenient.
The way they discarded Tylee was beyond egregious! Lori clearly had animosity for both kids but I think she had been fed up with Tylee for a while. Teen years are difficult for even the most loving of parents. I can’t imagine how someone like Lori managed to tolerate her kids as long as she did. Alex was probably a big help in that regard. As you stated, once Tylee wasn’t around to help, JJ became an encumbrance.
In this case, I’m afraid there will always be more questions than answers. We’ll never get an honest answer from either of them.
all JMO