1) If a player gets hurt during a game and they were healthy going into it, we'll move them to questionable (because they're hurt, and it's invaluable for owners to know that for waivers for the coming week).
2) A player's status will move to OUT if they are inactive (a healthy scratch). Like Mendenhall for Week 13.
3) An injury status will never get better between game-time status and around Wednesday at Noon.
4) Many teams don't announce injuries until game-time (similar to probably what we're facing with DMC this Thursday).
Most injury statuses come from official practice reports and are quite exhaustive.