User blog comment:Am Shegar of the Fairy Tail/Silver's Demon form/@comment-4449950-20150614113524

To be truly honest, I think it was just a stuff up by Mashima. I actually think his original plan was to have Deliora return through Gray's dad and Gray would have to defeat him and free his father, learning his father's Magic along the way. As such, Deliora would have been the Etherious/Demon form Kyouka was referencing.

Keith and all that weird stuff seems like it was a mid-arc change, or maybe it's just me. Dunno but that entire plot-point with Silver was just far too messed around to seem like the original plan that Mashima started with when he began the arc. Which is a pity, because Deliora actually got me so pumped.

But this is just my opinion. We'll likely never know .-.