And why would ma leave particularly if she had no involvement? Who warned them? Along with her taking the 5th... Certainly food for thought... I don't believe his phone call to her had anything to do with dinner either. Finally, I have a big problem with him coming back to ma's property to burn KB, a body and evidence. She is not exactly 80 and immobile and his child was there as well. It was not like it was at midnight nor a small fire, nor a short fire per KK. And with KK with him, that was no surprise to ma? I will just say if I killed someone (and I never would) and my ma did not know and I did not want her to know, I would certainly not go get the body that was already and bring it back to burn at my own ma's house to burn... And it "ain't" like this fire was way out at the back of the 35 acres... If KK could see ma on the porch, well then...
ETA: I almost forgot a mop and bleach at ma's which may or may not have related to the clean-up...