I think there is something of an issue with the game. The problem is, they came off the DL AFTER the season ended, but before the playoffs.
As a rule of thumb, if you get an injury that happens before rosters expand in September, and that player will be healthy at some point during the playoffs, then take the player off the DL after rosters expand, but BEFORE the season ends. (you still won't be able to play him, but you will have the ability to call up a replacement without using the DL)
If an injury happens AFTER the rosters expand in September, do NOT put the player on the DL, unless the injury will last past the world series. Again, you don't need the roster space created by the DL stint.