In my opinion is Ray haffner WHY??

just look when Lisbon in that dream or called what you want, Bertram and Smith called here LISBON, and Ray is the only one who called here TERESA.

Now go back to 6x01 Red john to Jane on the phone : Sorry patrick TERESA can't....

i also believe that the seven suspects are all connected somehow, there is a lot of possibilities
 and bruno is playing with our minds as he said in an interview about 6x01 that red john could be Lisbon or patrick jane.

I have to admit, Partridge was my No. 1 suspect. So after he died, I thought to myself, ‘Of course he’s going to go first!’
That’s the thing. Everyone has different No. 1 suspects, which is good. That’s one of those things as a writer; you can spend a lot of time weighing which one people think is the likely suspect. That’s very much a subjective choice. I know that are a lot of people out there who think Jane is Red John still
.…even though you’ve said explicitly he’s not!
I know. They don’t necessarily have to believe me, I suppose. I’ve never denied that it was Lisbon. So I suppose it could be Lisbon.