The Miami Dolphins left for Chicago on Thursday and released their first depth chart of the season. It may not be a 100% accurate assessment of where players stand, but it gives a clue as to what players need to step up.
Given the injuries on the roster, it is unlikely a player loses his job after week one of the preseason, but there could be mild shakeups toward the bottom of the roster. Most NFL teams enter camp having a good idea of what the roster will look like from top to bottom, but it's the lower ten players that will be decided by competition from the top 10 players who are released.