I think they had their suspects when they had their motive too. I suspect they are just finishing up the loose ends due to the sheer size of the scene(s) and number of victims. I imagine they have had tens of thousands of man hours in the crime labs, computer labs and in the field. Imagine all the print dusting on every inch of the dwellings, all the towed vehicles, dna tests on every dust particle and hair in the mobile homes and towed vehicles. I hope I'm right and that this will be concluded with multiple sentences handed to the perps.