If i'm not mistaken, this is a totaly different series, which has no connection to the "berserk" manga. Edit- xi0 was quicker than i was
Gutts's quest is to kill griffith, avenge the (real/old) band of the hawk and return Casca's sanity. There were apostles/monsters before Griffith turned into a "god hand", and i believe they will remain even after Gutts's quest.
I've been thinking over this theory for a while, and i am really looking forward for the next chapter to come out, and have the story progress to its final stages (the ending of Berserk), and i simply can't sit idly, while doing nothing. Anyway, my theory is that everyone had a dream where a "
white hawk" will save everyone,
light the darkness. Ever since
Gatts used the berserker armor, a part of his hair turned
white. I think that as the story progresses, as Gatts uses the berserker armor more frequently, his hair will continue to turn white, until he is completely white. As we all probably know,
Griffith after becoming a god hand, "Femto", is a
black, devil like "angel". Therefor, i believe that the "white hawk" that appeared in everyone's dream is actually Gatts, and the darkness, "the black clouds", is Femto. Following this theory, i assume that in the future of the story, the "white hawk"- Gatts, will fight the "evil soldier" section of the new band of the hawk (the apostles), while trying to persuade the "human army" to change sides and realise that Griffith isn't what they believe he is - a saviour.
I'm probably not the first one to come up with this theory, so sorry in advance if i stole the idea.
Reference:
"White hawk" dream:
http://www.mangareader.net/96-1152-155/berserk/chapter-32.html
http://www.mangareader.net/96-1152-156/berserk/chapter-32.html
Gatts's hair turning white:
http://www.mangareader.net/96-1147-196/berserk/chapter-27.html