This is not a theory.
I am a little mad because if i was writer of this awesome story i would plan ahead.
I would decide who RJ is before the first episode airs, I would decide how they will discover him and capture him and i would think about the first episode in which i would put him. I have a feeling that the writers changed their minds on who RJ is many times throughout the series. If you write this awesome series you better plan everything about the main story. I would develop RJs character more, he would have at least 5 appearances throughout the series. I would develop other characters ,like RJs suspects, more so they become suspicious to the viewers.I mean i will be satisfied with RJ only if he is brett partridge or if he is Walter Mashburn because they show up early in the series and they seem like sociopaths and they both seem like they have something dark around them. But then again they werent developed enough walter mashburn appeard only twice.I only wish that writers planned ahead and decided who RJ is straight away and that they developed him some more and other suspects too.