User blog comment:Omega natsu2/Chapter 367: Jellal vs. Oración Seis, Predictions./@comment-190.172.188.65-20140113050538/@comment-4829046-20140113083922

Actually anon, you are going the right track of my own theory of an "alternate Gray". But in my theory, he came to the current period at a time when he was young. This would explain the lack of a proper scar, as the events of Galuna Island never happened to that particular Gray. But yes, it still has a lot of holes as to why he works for Demons.