User blog comment:LordLuminous/Silver being Deliora = Impossible? Theory/@comment-24066070-20140706124430/@comment-85.221.190.231-20140706125208

But:

1. We're given information that Keith is necromancer around time that Silver reveals he is Deliora - this might suggest that original Silver was revived;

2. In mangastream translation Silviora said "it is true that your father is alive" - might be translation problem, we don't know though;

3. His behavior - especially with Lisanna - is suspicious and might suggest there's some of original Silver left in him.

Definitely not proofs, but I think it's too early to say it's certain that Silver is totally dead.