Here's a possible scenario: Banks is thought to be in the "doghouse" last week by players who are behind him on the depth chart. For whatever reasons he remains on the field Saturday night and the supposed opportunity for PT by the backups passes. After thinking about it over the week-end, the backups see the handwriting on the wall and it is apparent that they are not part of the big picture and their noses get out of joint. So they quit. Happens all the time, i.e.Bates in '08.