Assuming that one of the seven is really rj, then it has to be Brett Partridge. Apart from the fact that he was introduced right from the first episode, he is also the only name (out of the 7) that appers on the page of pj's initial agenta of suspects as shown very briefly at the finale of s5ep9. In fact the name is less visible due to the shade of pj's finger, but if you freeze the picture it is very clear.
