User blog comment:IamJakuhoRaikoben/Chapter 467: Mother's Key, Review./@comment-5303512-20160105005300

Another thing that makes my theory that the Spriggan 12 Jacob is responsible for Marin's sudden attack might also play into the whole story with Layla and Grammy. He might be the cause of Brandish joining Alvarez and why he had Marin try to kill her to silence her.