I don't see any way that RJ is a group of people (like the whole list). RJ is a serial killer that kills people for, among other reasons, talking bad about him on TV. IMO the only way a group RJ works is if everybody they kill is for political reasons or to protect the group but we already know that isn't the case because what would be the purpose of killing PJ's family, the reporter, etc. RJ has subordinates, disciples and friends but IMO the man himself has to be a person not a group.
Regarding the bird phobia RJ may have which stopped him from killing Lisbon, I would be pretty disappointed if that were the case. With the mental capabilities exhibited by RJ I personally would be shocked if he has a major phobia of a nature that would impede his ability to carry out whatever his plans may be (including killing Teresa). Here we have this ultimate badass with superior mental abilities and he is incapable of overcoming a phobia that would affect everything he does? (birds are everywhere).
I know they hinted at the possibility but I believe not killing Teresa was part of the plan and the birds are just a red herring.