I have a few thoughts. If anyone likes any of the thoughts please add to the theory since Im not an expert on this.
Ray Haffner first appeared after Jane killed the fake Red John....Whats the significance of this?  Why was he trying to get so close to Jane?  Does it make any sense that Jane would be the only one on the team allowed to stay.
Jane asked Lisbon about him and was told he is an expert on surveillance.  I dont remember him ever asking about anyone else.  Is there any significance to him being an expert on surveillance? Is it a hint that Red John(?Haffner) was watching him up close.

Any connection between Reede Smith name and Ray Haffners real name(actor name is Reed).
Reede Smith - this is a stretch but Reede ( is basically the name Red w 2 extra e's) Smith(most common name like John).  Is it a hint or a stretch