Well again Tempesta has shown little to no characteristics involving lust and Sayla's appearance just fits better to me. As for Silver his magic suits the punishment in the ninth circle much more than the third as the damned are encased in ice much like the giants in the village with the sacred flame.

As for reasons for them becoming humans I personally believe if anyone was to have been a human previous, it would only be Silver and I don't believe the circles would relate to their reasons for becoming demons as I believe the other eight should just be straight out of the Book of Zeref. Still even if Silver used to been a human, it still works for treachery as he would be betraying the humans to become a demon.

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