I don't know why everyone is talking about gps devices as some kind of solid evidence.
As we saw before RJ is not some kind of a beginner.He knew about trackers and if he's on the list of 7  for sure  he didn't bring his phone while "working".
Jane knew from the beginning that RJ will find out about the trackers.
The question is what is he offering to his minions so they follow him and die for him.
He is not a lonely psychopath but a mentalist who can control and give orders to high ranking people in state law enforcement agencies.
 That person must have qualities of PJ, Mashburn and Stiles.