First of all,Jane isn't RJ,and RJ isn't a group of peole.Thank you.
Now lets move on the theory.
My first suspect in the series was Brett Partiridge.And he still is.I know that you guys will say that he is dead,but he is the weirdest guy i have ever seen in series.He also fits the profile of Sophie that described RJ.I think that he will make a comeback in the series.We never seen his body after that sceen with Lisbon in dark house.Just like he deasapeared.And it is possible that he is the woman that is feeding pidgeons because that "woman" has got same ring as RJ in the episode Red Is The New Black.I suggest that you don't change your minds because you are falling into a Bruno's trap.He wants us to suspect everyone.Suspect someone that you first think he is RJ.That's my suggestion.

So that is my short theory,comment below so I can see your thoughts. :)