S/he looks like a combination of Jessica, (Beatrice?,) Shannon, Kanon, Krauss and Natsuhi by current notions. So it is Jessikraushkanonnatsutrice.
It was stated in red that because of Battler's sin a lot of people die on Rokkenjima. Everyone dies. No-one escapes. Doesn't necessarily mean everyone's death is because of Battler's sin, but many anyway.
I'm under the impression that different variations of the pony theory (that is the one with <see you again> and the lot right?) is the most populat theory of Battler's sin nowadays.