Hi! I am new to wiki and I just came up with some theories!!!
I started reading the manga a couple of days ago (edolas + s-class arc) and I am afraid that the lifeless hand in Charla's vision is Gildarts' (that's why Cana is crying and Natsu is frightened) but what makes me feel I am wrong (and I hope I am) is the fact that Gildarts has bandages around his right hand, something that is not the case in the vision!!!
I also read the chapter 234 and I think that boy is Zeref!!!