As facts seem to point:
- Red John is most likely a man
- Red John should be older than 30 years

the last would left out Kirkland and Partridge, but
Patrick has a list of 7 suspects, seven as the number of letters in "Red John":
what if John is not a person?

Could be that all seven suspects are Red John, being that just a fake character used by all of them,
That would explain why it has been impossible to find any coherent clue on all John's murders, Partridge and Kirkland may just be the latest members of the "club".

All 7 suspects had trackers placed on them and all 7 were in different places.

One of these statements is true

1) BP is alive and is RJ as he is the only suspect tracked to that location
or
2) RJ gave his phone to someone else, (accomplice) and killed BP he would not be able to do this without someone's help from the team thus knowing where BP was. So one of the 3 is definitely involved
or
3) RJ is not on the list of 7 and is someone else.

Is not a theory but I was thinking about the name Red John. It is not clear who chose to call him that way... in the note in Patrick's bedroom there is no signature so I was thinking if it was Red John himself who chose the name or if it was the police who started calling him Red John. I don't know why but I have a feeling that this name thing will be important in some way...

Maybe all seven are working as red john together..... So On different rj murders they each have an alibi? idk its a long shot but yeah

Some thoughts, mostly about S06E01.
1) If you re-watch the first four minutes of S05E22, you'll see a very interesting scene including Jane meeting Partridge. Could be a false conclusion, but Jane's reaction to Partridge points that he suspects Brett (as RJ or as an assistant). So, I think, Jane believes his list is true.
2) In S06E01, when Jane calls Lisbon, she says "Not now, Jane" (sitting in the office and watching the map with seven markers). Why? What was she busy with? Waiting for something? Just a moment later she gladly answers her office phone.
3) A very interesting picture on GPS mobile tracker. Kirkland's phone is in Los Angeles, S1 is in San Francisco (Stiles or Smith), Haffner and S2 are somewhere near Sacramento, but not in the city, the same for McAllister (but not in Napa, strangely), and only Bertram and Partridge are in Sacramento. Just let's remember this for further observations.
4) Don't think it's important, but wasn't Lisbon right-handed? In S06E01 she holds the gun with her left hand.
5) What was wrong with bathroom? Lisbon and Partridge were not alone in the house.
6) Ron's strange appearance means that we should consider some personalities not included in the list as RJ or his assistants.
7) We clearly see RJ talking to PJ and at the same time holding the "knife" in the left and cleaning it by the right. Believing that a human being, even RJ, couldn't have three hands, either RJ uses some kind of earphone, or we are dealing with two persons.
8) I can't believe we'll be informed about RJ's identity in S06E08. I'm not a fan of kind of "he is many" theories, but unfortunately we are directed in that way. So probably only one important name would be revealed in S06E08.

What if PJ and lorelei made the video together to test Lisbon and the others at the CBI. That way PJ would know if one of them was a RJ accomplice

Question that just popped in to my head:
Why didn't Jane just rush to Bertram's office as he was on the phone with Red John? And if he would be in his office then Jane would have one less suspect on his list, right?