I don't see where anyone said that the two departments haven't collaborated. In the beginning, Kentucky's Commonwealth Attorney said there were similarities. Dewine states here, “I am sure our investigators have looked at that case,” Ohio Attorney General Mike DeWine told WSYX. “I have not looked at it and I am not going to comment further on it.”
They may know all three murders were done by an organized group but without the individuals that did it, there is no case...