As many theories here said, I also hope that RJ and the "Tyger, Tyger" groups are separate things, it would be a massive anti climax if RJ wasn't a specific person and a group. I also want RJ to be against the "Tyger, Tyger". However, I have a feeling that PJ is playing a trick with the list. Firstly, he told Lisbon about it, he knows perfectly well that it would put her in danger and all the people she tells (PJ knows she will). I predict that PJ will find RJ soon enough, however, he will be faced with a choice, kill RJ or accept his help and take down the "Tyger, Tyger" group. I reckon he will take them down and kill RJ later. I also think RJ is being made into a more or less sympathetic villain by Heller, for example RJ helping PJ in season 2 (I think, when PJ was tied to the chair). Also the numerous times RJ was trying to reach in to PJ and make him his friend. I for one, am really excited about the prospect of PJ and RJ teaming up for a little, the "Tyger, Tyger" group should be no problem for the 2 of them. We can see that RJ already started to take out some of the members of the "Tyger, Tyger" group by killing Partridge. I also think that the everyone on the list bar Kirkland and RJ are members of the "Tyger, Tyger" group. Haffner is my choice for RJ, he fits the descriptions and seems clever enough to be RJ + he works privately now, unlike the majority of suspects who work for the law enforcement.