Reili
Well, you just confirmed my personal head cannon that the Seven Sins were actual titles that could be earned. My main theory was that each of Shiros' party members tend to follow one of the sins and that they would eventually all earn a title or at least skills like with Yins Gluttony skill. Of course this theory of mine was more of a crack theory with no real evidence but with this turn of events I think my thinking wasn't too far off.