Who replaces Washington?

With Cornelius Washington out for at least one game and probably two the question is who does Grantham put in at OLB? The first thought would be a combination of Chase Vasser and Ray Drew as they have have been the backups this season. However Grantham has said time and again that he will put his 11 best on the field. With the return of Robinson his best four linebackers are Herrera, Gilliard, Robinson and Jones. I don't know if they will play all the snaps at OLB as a lot of it will be determined by how many snaps Robinson is ready to play but my initial thought is that Herrera or Gilliard will be moved outside to start for Washington.