Who is Red John

From wiki:
"Reed" is commonly believed to be a nickname-derived surname referring to a person's complexion or hair being ruddy or red.

Etymology and history
Although the name is derived from a common occupation, many later Smiths had no connection to that occupation, but adopted or were given the surname precisely because of its commonness. For example:It is common for people in English-speaking countries to adopt the surname Smith in order to maintain a secret identity, when they wish to avoid being found. Smith is an extremely common name among English Gypsies; see also John Smith

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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

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Theory #3019 • By ahmed

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I think that the list of 7 names that janes came with is something RJ could have reached to using the information brought to him by Kirkland and his mind ... but I also think that pj knew that rj will send some one to know what he knows who in this case is
Bob Kirkland and thats why he displayed the information that he wants rj to find leading him to the 7 names list >>> and I also think that the way rj found out about pj happy memory is from hypnotising
Lorelei Martins before kiling her (because she was close to pj and he might told her things about himself) ... so my Conclusion is that the identity of rj is not among the 7 names in the list but pj has another list that rj never reached to and he wont and the reason he was mad in the Message
Lorelei Martins read was that he sensed that pj manipulating him and he is close to find him or it is because there are some of his helpers in the list .

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Theories of ahmed (3)