This is not a theory and maybe I'm wrong but..... 
Season 6 Ep. 1 - at 37:00

You can clearly see the 7 suspects on the map, and their adress on the right.

K is Kirkland (and he is in L.A.)

S1 and S2 are B.Stiles and R.Smith.
I suppose S1 is R.Smith, because alphabetical order (Sm-St) and because S2 is on TRANSIT but close to Davis (Visualize HQ), so he will be Stiles.

H is R.Haffner (on TRANSIT too)

M is T.McAllister (TRANSIT, but in Sacramento Valley)

B is G.Bertram (725 Delta Ave Sacramento Ca)

and P is Partridge (5570 West Huron Sacramento Ca).

Noone can say who's RJ from that of course, because 1) nobody is in the same place (they are closed but not in the same place), and 2) this stupid Lisbon plan can be easy tricked just leaving the phone somewhere.

But...
The strange thing is "725 Delta Ave Sacramento" (Bertram).
There's no Delta Ave in Sacramento. There's a "Delta Queen Ave" but it's not there.
I checked very precisely, and Bertram's Red Dot is here: "38.423397, -121.289527"
(StreetView, then look at the Red Gate). Coincidence, Bruno?
 
:)
  

I agree with the posters who say Bret Stiles has some connection to Red John (Brett Partridge). I'm not necessarily sure if he they're father and son, but it is possible. Maybe Bret with one T was Red John back in the day and taught Partridge the tricks of the trade to carry on his legacy.

I was thinking about the poem Tyger Tyger the other day, and the thing that kept popping up in my mind was the question in the poem: Who "dared" create the Tyger? It is an origin story. Who was responsible for making Red John what he is? His father? Maybe. That is the central question of the poem with regards to the Tyger.

Fearful symmetry? How about Brett and Bret. Father and son? Mentor and apprentice?

Another idle thought which probably isn't relevant. Tiger spelled with a Y instead of an I(archaic English), Styles spelt with a I instead of a Y? Symmetry? 

Brett Partridge alone, doesn't seem to make full sense as Red John. He lacks the charisma, the high level connections. Brett Partridge and Bret Stiles working together would make for quite a team.  

As of right now I don't lean toward any of the 7 being redjohn. All i know that each of them has at least one reason as to why they're on the list and jane would have his reasons to put them on the list so i trust jane's reasoning. And I do believe that bruno heller is smarter than all of us here, he's had 6 seasons to plan everything. We could be guessing the right things or just wasting our time here. So I'd prefer to get whatever clues I can get but allow myself to go along with the flow and have fun with it.

What I do want to say is that do you guys realise how many times its been repeated that redjohn is always 'One step ahead of jane'. But what if... what if jane is actually one step ahead. What if he knows that Bob Kirkland has a relation to redjohn thus explaining why he 'allowed' bob to break an entry to the rooftop place and then when bob passed the information to redjohn, redjohn could follow jane's thoughts and come up with the list of 7 suspects before jane did. Or at least before jane showed lisbon the list. But in truth, jane actually has a strong hunch who redjohn is out of the 7. And he told lisbon because he knows lisbon would want to tell the rest of the team. He wanted lisbon to act the way she did and bug the phones for whatever reason that only jane knows. However he probably thought he could catch up with lisbon before redjohn does anything to her. Clearly he got that part wrong. 

Maybe jane is doing one of his things where he pretends he doesn't know anything, but in truth he's playing the role of the mastermind and trapping redjohn.