Hello there, i'm new to D.Gray-man and just read it (in two days) so with this wiki I've been trying to clear things up.
Apart from the main turning point of the plot, which regards the identity of Mana/Nea/(Tiky ?), my attention was drawn by something else. It first came out as "whose side is Road on ?" and by rereading recent chapters I refined the question as "who is against who in this holy war ?".
As you now the 2 main opponents in this holy war are the Black Order and The Noah.
However what interests us today is what Cross refers to as "the hidden side of the Holy War" in Allen's Dream (also way before in chapter 167), which leads to the third protagonist of this war : The Nea-Cross group.
So my first question was : is Road part of this group ?
My answer to this question would be yes, indeed Road has shown overwhelming affection towards Allen/Nea, even protecting him against Apocreepy. There is also the fact that she really loves Tiky who seems to be Nea former incarnation's doppelganger. And while she says to Wisely that Nea's is creepy she also warns Nea's that Allen is dangerous after the latter meets with cross in the dream.
To go even further in that theory, i wonder if Road might not be the trigger for the Earl wanting the 14th back into the Noah's family. Indeed it seemed not logical to me that the Earl would want the traitor back during the Alma arc, and the fact that the Earl is drawn to the 14th might be caused by Road. Anyway, Road being the sole survivor of Nea's massacre is suspicious, and she seems to know things only her and the Bookman now, perhaps also keeping her miniature form is something she does in order to avoid being read by wisely.
Now what about Cross and Nea ? They seemed to work together, but I think Nea is kind of a backup plan for Cross. To me what Cross wants the most is for Allen to succeed, i don't see otherwise why he would tell Allen to go seek the Bookman in the mansion. This idea is also shown by Road when she says "we are being used by them, "Allen" is dangerous", them being Road+Nea. However it seems that following Nea was originally Cross's plan and that Allen determination gave him another, better exit to the Holy War, and he verifies that determination when, within the dream, he clearly states that it is the end of Allen, but then tells him to walk forward, which is in itself contradictory.
So it appears that because of Allen, the Cross+Nea+Road+Allen+Tim group split in two.
However i think there are other people that belong to that special group of protagonists.
One of them would be the Bookman, it indeeds appear Cross and him seem have strong connection and he knows about the "hidden side of the war". I think he also states somewhere (but i can quite remember) that he is the only person who knows a specific thing about Allen or Cross (please tell me where if you remember). And although the bookmen are meant to record history, they role might be a little more than that, otherwise why would the bookman wait for Allen ?
The only other whom i can think about is the man in the background in page 17 of chapter 218 (which is imho one of the most revealing drawing with page 15 chapter 135). Who is it ? Is it another bookman ? A Noah ? A friend of Cross ? The appearance of this man is anyway very troubling as he seems to be a key to the story but all we can see is his strong glance.
On a final note i think that the wonders around Mana Walker/Cambell identities and Allen aging in reverse (or being two different persons) are strongly related to the protagonists of that hidden side of the war. I think we will know more when Allen meets Bookman or when Wisely/Road explain who Mana is to Tiky. Now we have to hope the chapters will come asap...
PS : Sorry if i have made English mistakes i'm not a native speaker ^^