I agree. I think Sandy, dumb as he is, might spin it as accidental in his head but nevertheless he contributed to Erica's abuse; remember how Jamie testified she had a bald spot on her head from Sandy thumping her? Ugh!
The good news is that I believe LE will have enough evidence to show felony murder even if they can't prove premeditation. Just the broken bones that healed wrong combined with photos of duct tape "casts" paint a pretty horrible picture of Erica's life with Casey and Sandy. Add urine and blood in a closet FFS, and well...
But yeah, I think Casey is directly responsible for Erica's death and I hope like hell LE can gather enough evidence to prove it. IMO I think Jamie's testimony may be very important if/when this case goes to trial.
In the meantime, we wait for charges. I can be (kinda) patient since I believe Salisbury PD will bring justice to Erica.