User blog comment:B214/Question and Answers 2/@comment-85.154.53.117-20140308194354/@comment-24651810-20140308220220

Jeanne is being interrogated by the Gregori. There is nothing that shows what they'll do with her but they probably wont let her, Cao Cao is there because a God made him, so he is that God's representive. Not to mention with the holy spear he'll be of use. The other two are up in the air as well but since the author hinted it and because they have their own high powered Longinus they will be of use as well.