“strong evidence because of the cement etc”
Which is what differentiates the Anthony case from Peterson’s.
Where's the "proof." A lot of people use cement for anchors. It's heavy. Maybe some one else killed her with their anchors. They could have used the same type of cheap containers to make them.
Where's the proof those cement weights were the same weights he made? Was there DNA? Finger prints? No, there wasn't. It was assumed only because it made sense. The jury used reason, not just the few hairs they had, to decide his case.