User blog comment:CNBA3/Super Big Theory!/@comment-24066070-20131026202557

I doubt Gray would be "the chosen one" if there is a chosen one, then it's Natsu (or just the Dragon Slayers alltogether).

Why would demons be immune to earth-based magic? Not sure what u mean there: either Earthland magic, as in any magic that isn't Devil Slayer or do you mean earth magic, like Jura uses? If it's the first option then only Silver would be able to fight Tartarus, since there ar eno other confirmed Devil Slayers. Would be a bit too much if literally nobody could even harm them.

If Silver really is Gray's father who could use Ice Devil Slayer Magic, it would mean he failed horribly against Deliora (much like all the Dragon Slayers failed to beat a dragon during the GMG)

If I'm correct what you basically mean is that Gray has inherited Ice Devil Slayer Magic from his father Silver and that he will be the key to beat Tartarus.

I do see Gray somehow copying the Ice Devil Slayer magic after "absorbing" or "guiding" it in the Sun Village, but I'm not too sure about his connection with Silver, but time will tell.