User blog comment:B214/Chapter 499: Gray & Juvia/@comment-5303512-20160829121430/@comment-5303512-20160829123057

Do you honestly believed that Silver had a demon form when he was just possessed by Deliora based on his cover story? Besides, he was basically a corpse when Keith was revealed to be a Necromancer so there is that.

Besides, there is always the highest chance that he does have a demon form yet.