I keep thinking what the rental owner said about feeling sorry for the child who was so frequently alone out the front on his bike for hours that she confronted SB over it

We know she also put him in the suitcase.
The child was 9 years old when SB was arrested. SB had been in that house with JT as the co-leaseholder for over 3 years as they moved in jointly (SB later had JT removed off the lease). We know SB's violence and drunken behaviour started before she even split up with her ex husband, so it predated moving in the house.
So, for at least 3.5 years after the drunken violence escalated out of all control, the child was between the ages of approx 5 - 9 years old. A child should not have been unsupervised at any time with SB IMO. SB should not have been tasked with collecting him from school (which she failed abjectly). SB should not have even been driving, no doubt half the time under the influence! SB should never have been alone with him, not allowed to bring him inside her home, never mind having him overnights. It's heartbreaking.
JMO MOO