in Red Laquer we learned two things. One...almost for certain CBI Ron is not anything but a good cop. I mean he arrested Elise on PJ's orders. Even being slightly the ego maniac that RJ is this wouldn't happen this way. This leads me to another assumption Brett Partridge is in this episode too. Although he is creepy, most people that deal with the dead are off a little. Also he is not RJ either because there is nothing there. Since the red barn episode patrick has narrowed his list down well to the point where most of his suspects he would want to get more info out of them he doesn't talk to Ron and doesn't even want to talk to partridge. That seems to me as solid proof they are not on his list.
So next week we get Lorelie back...big turn of events on the horizon