Well, I'm reviving this thread (and double posting, which you won't see often) with something I never paid attention to until today and that I think could be a scoop. Of course, it remains speculation for now so don't take it as a verified fact.

As you guys may or may not know, Miura added a page in volume 28 like he often does; this page is in episode 238, when the group is on the beach and right after they found the Moonlight Boy. I will post the part of this page that interests us below.


As you can see, he's noticing a presence. Someone was there. This in itself already means much, but it could be Kushan casters (prior to the attack) or anything else. What matters is a panel on the following page, one that was already included in YA but that could have stayed unnoticed forever without the addition of the new page. It's this panel:


A closer look at it:


Doesn't it remind you of somebody?


Yeah. I could find a better shot but you get the idea. And what this implies is pretty clear: The Moonlight Boy = Griffith. Of course, Zodd could have only been there on his own to spy on the group, but does that sound likely? Not much to me. The boy even got on the cliff when he disappeared, it can't possibly be a coincidence. And it fits with the fact Griffith felt the Demon Child's feelings inside of him. From that point on the speculations can go in every direction: the boy could have momentarily taken control of Griffith, or Griffith could have consciously done it, maybe out of guilt, maybe because he felt like being a family, etc. He could have a split-personality now. Or maybe the change in him was a lot bigger than we thought. Maybe the so-called "remnants" are an integral and vital part of him. And he can change his appearance too. I do think it was the boy's side in control at the time if that whole theory were to be true. And that'd also mean he can suppress the effects of his power on the Brand. Remember when he looked at that crocodile in the hut? Or when he repulsed Guts effortlessly? And yet nobody (well, neither Schierke nor Guts) noticed anything peculiarly odd with him, just a strange Od but nothing more precise. That's the power of a member of the God Hand.

It also adds a whole new dimension to Griffith's character, perfectly following what Miura introduced in volume 22. I can't help but marvel at how vicious leaving these clues is though, yet I just love it. So logical and obvious too, right under our noses all along. All it takes is to pay attention, let this be a lesson to everybody. And to me it even feels like Miura thought while compiling volume 28: "Bah, they'll never find out if I don't leave a bigger clue... *sigh* Ok, let's go for a big obvious one with a new page."