I reckon the "Tyger, Tyger"  group isn't associated with RJ. RJ seems like a guy who takes a lot of pride in his murders. He has his follower, who are usually used by him in order to pass on messages (the woman who gave the CD to PJ) or cover up some lose ends (the woman who killed Bosco and his team). However, I think all of his disciples end up dead pretty quickly, they clearly don't mean a lot to RJ. Why would RJ have a group of quite important people supporting him? He doesn't need them and they can take some credit away from his "work".