Board Thread:General Discussion/@comment-6192846-20140918010005/@comment-6192846-20141228011929

Allen points out the fact he already knows everything about the individuals involved with the vessels of sin as is, but Sickle believes he needs to talk with thir souls himself and acquire an actual understanding of them and their lives.

Of course, Sickle doesn't explain what purposes this serves either. Since the prologue ends before he meets with Sati, we won't know until February.