In no order my top 3 suspects are

Ray Haffner
Gale Bertam 
Sheriff Thomas McAllister

So...Heller said that we would all be disappointed when they reveal RJ identity...and honestly thinking, everybody from the list wouldnt disappoint me of being RJ...any of them would be so obvious to me once RJ is revealed by something...example Stiles the smart and charming powerful man, or Kirkland who is acting strange all the time, Brett P. the psycho, or any of them would be a RJ to me by something..if you get me what i mean...and they were all RJ to me by something ..who could disappoint us much more than the people that are not on the list of being RJ....the list is there, its legit but what is PJ has an other list?

Please think about RJ as a person who would disappoint you the most...if its from the list or not...think widely!

  I noticed thet there is powerfull name symbolism in this tv show and in my oppinion the most powerfull name in this show is REEDE SMITH and il explain why :
PART 1
Fitst of all the names in question:
1. REEDE SMITH
- REEDE is a variation of REED [ From an English surname which comes from multiple sources, including Old English read meaning "red" (originally a nickname given to a person with red hair or a ruddy complexion)]
-SMITH [From an English surname meaning "metal worker, blacksmith", derived from Old English smitan "to smite, to hit". ]
2. ROY TAGLIAFERRO
- ROY Anglicized form of RUADH [Gaelic byname meaning "red", often a nickname for one with red hair]
-TAGLIAFERRO: Virgil Minelli first realizes "Tagliaferro" means "cut iron" or "cutting iron" ("taglio" = "cutting" and "ferro" = "iron") in Italian.
3. RED JOHN
- RED: It was originally a nickname given to a person with red hair or a ruddy complexion.
-JOHN [ English form of Iohannes, the Latin form of the Greek name Ιωαννης (Ioannes), itself derived from the Hebrew name יוֹחָנָן (Yochanan) meaning "YAHWEH is gracious".
-YAHWEH [A name of the Hebrew God, represented in Hebrew by the tetragrammaton ("four letters") יהוה (Yod Heh Vav Heh), transliterated into Roman script Y H W H. Because it was considered blasphemous to utter the name of God it was only written and never spoken. This resulted in the original pronunciation being lost. The name may have originally been derived from the old Semitic root הוה (hawah) meaning "to be" or "to become".]
-So if JOHN means "YAHWEH is gracious" and YAHWEH means "to be " ,"to become" then JOHN means : "To be gracious";"To become gracious"
Now RED JOHN is the stage name the time when he shines , the time when he is gracious and the rest of the time he is a normal guy an ordinary joe .

PART 2

Besides of the name there is the issue of the William Blake poems wich kind of fits REEDE SMITH :
-To understand "The Tyger" fully, you need to know Blake's symbols. One of the central themes in his major works is that of the Creator as a blacksmith. This is both God the Creator (personified in Blake's myth as Los*) and Blake himself (again with Los as his alter-ego.) Blake identified God's creative process with the work of an artist. And it is art that brings creation to its fulfillment -- by showing the world as it is, by sharpening perception, by giving form to ideas.

*Los, Blake's spirit of poetry, vision, and liberation, is a blacksmith.

William Blake structured his poem with six Quatrains, or four line stanzas. In these stanzas, he uses a variety of rhyming couplets, repition, powerful imagery and alot of rhetorical questions to enhance the piece.He begins the first quatrain with “Tyger! Tyger!burning bright.” Right away he uses repition to catch the reader’s eye. The word “Tyger” is a symbol of all creation. In his poem, “The Lamb”, he uses the Lamb as a symbol of innocent mankind, where as the “Tyger” is a much more wild, mysterious and ferocious animal capable of great good and terrifying evil. Blake then supports that idea by describing the Tyger as “Burning Bright” The burning bright meaning being so ferocious, being so capable, so intelligent, and having the power to do anything. Going along with the idea of the Tyger being a wild, mysterious creature, he uses powerful imagery with the line “In the forests of the night.” This imagery creats an awesome scene of a dark, mysterious environment in which the Tyger is lurking. This suggests that the Tyger is like a creature of the night, very dark, very mysterious, and again, capable of doing unknown goods and evils. Blake ends his first quatrain with a rhetorical question. “what immortal hand or eye could frame thy fearful symmetry?” The immortal hand or eye Blake uses is referring to a God. So he is saying, what God could create or “frame” somethin g that is both beautiful, symmetrical, and also so terrifying and fearful. The God who created such a creature is fearful because he made this beautiul creature of mankind to have free will. With free will means that they can choose to do right and wrong, and that in intself is terrifying.

So as you can see in the end there is a powerfull symbolism in the REEDE SMITH first of all from the names REEDE SMITH -> ROY TAGLIAFERRO -> RED JOHN
And then secondly William Blakes poem "The Tyger" has a powerfull symbolism in wich the God Creator is a Blacksmith from here the resamblance with the names SMITH and TAGLIAFERRO

PART 3

We've seen on other occasions along the show that RED JOHN used anagrams so its nothing new to him to do it again .
REEDE SMITH is the anagram for THE RED IS ME yet another reason to belive that he is RED JOHN

As PATRICK JANE said countless times along the show :

"THERE IS NO SUCH THING AS COINCIDENCE"