For those who are new to keeper leagues, please note that the 28 players on your roster are fixed for the season (except for trades). You can use 24-28 of them in the game engine at any point in time, with free movement of your 28 between the active roster and the reserves. There are no drops (other than as a result of a 2-for-1 trade, etc.) and no free agent pickups during the season.
You drafted 'em, so learn to love 'em!