I DON'T THINK it's PARTRIDGE.  I think he's dead.  But this website won't let me pick the one I really accuse.  
Anyway, could Jane's FAKE list of 7 suspects hold symbolism for the 7 deadly sins?  I think that points to these characters all having a weakness that will lead to their undoing, and the proving that they're not RJ. 

 
1.  Sheriff McAllister:  SLOTH.  He's a REAL DONUT SHOP COP.  About 20 steps behind everyone, including himself.

2.  Ray Haffner:  GREED.  Money talks but RH is seriously motivated by money as his main interest and goal.

3.  Gale Bertram:  GLUTTONY.  At first, I thought him GREED -- because of GB's poker habit but I realize he has more the desire to win than to just have money.  Another definition is "the ability to withstand," as in glutton for punishment, which GB certainly is, and also an excessive "love of power," or at least for GB, a love of looking good.

4.  Reede Smith:  I thought Gluttony because of his obvious physical appearance but his true point of his nature is: WRATH.  The guy has serious anger management issues.

5.  Brett Partridge: LUST: or blood lust [ghoul!!]

6.  Bob Kirkland: ENVY: he truly seems in direct competition with Jane and the CBI, but why?  We don't know yet.

7.  Brett Stiles: PRIDE:  the biggest ego of all -- I think he could have a connection to RJ, but isn't actually him.  [Perhaps a father or father figure maybe]