"Dumping a body weighed down by cement anchors is plenty proof of a murder having occured to me.
I agree. Except that no such anchors were found weighing down the bodies and what anchors were presented as "evidence" did not match the anchors that were made with the mold Scott used to make anchors. There is no evidence the bodies were weighed down at all. Being dumped in December they would not have needed any weight as decomposition gases would not have bloated the bodies in 40 degree water.