First, I will write an observation that made recently. When RJ paints the smiley face when he kills, he does so with 3 fingers, and the outline of the face looks like an mirrored 6. So it is RJ's way of embedding "666" in every kill. On the first episode of season 6, 666 was written on the wall as well as the pentagram. I think this ties well with the great theory detailing how RJ is attached to the works of William Blake.

Now, regarding the latest episode, I am starting to believe that McAllister might be RJ. I don't know if that is where Bruno Heller is steering our minds, but I think I am starting to see him as RJ. Now let's examine the facts:

1- The person who presumably killed Partridge and presented himself as J. Roth fears birds. Also, episode 2 was titled "black winged red bird", which might be a clue to who RJ really is. 

2- He has an acute sense of smell, shown when he knew that the dead man was a Pizza delivery guy by the smell of oregano. RJ has a smell fetish as demonstrated by the fake RJ when he detailed the smell of PJ's wife and daughter.

3- McAllister said" duck-pond killer case" which shows what he noticed the most about the pond, birds.

4- Fear of birds confirmed on the rooftop.

5- McAllister voice. I am not sure about his voice, but it seemed to me close to RJ's voice.

RJ might be McAllister, or McAllister might be a bait to distract us from the clues that point to the real RJ. However, for me, I would be disappointed if the real RJ was McAllister.

Also, a few questions about the promo of next week's episode:

1- Is the list with Kirkland the same as the one with the 7 suspects by PJ?

2- Was Lorelei Martin alive when Kirkland showed her body to PJ? I am thinking about this since last season because Kirkland infiltrated PJ's room after Lorelei was shown as if she was killed by RJ. If she was really killed at that time, then Kirkland apparently doesn't work for RJ since he won't be torturing PJ for the list in the next episode. However, if Lorelei was alive by the time of Kirkland infiltration, then the list of 7 is no longer valid, and Kirkland wants the real list of suspects from PJ. Heller didn't say that the list is the real one, he just said that the real RJ is among the suspects on the list.