Cleveland's backups are currently Cody Kessler and Kevin Hogan. Now it is Drew Stanton. Depth chart of Taylor, Stanton, Darnold ensures Darnold gets some time to develop. Darnold is better than Kessler and Hogan right now, and probably Stanton too, but this gives the option of not rushing him, plus gives a backup QB next year if Taylor is gone.