The NFL rules state that no team can have more than 80 players on their full roster to prevent teams from using their injured reserve list as a way to stash players for the future. When William Middleton was sent to injured reserve, David Jones was signed and represented player #81 on the roster. The Jaguars were forced to waive/injured WR Mike Sims-Walker to bring the injured reserve list back down to 19. While Sims-Walker was unlikely to be a member of the Jaguars next year anyway so it's not a particularly horrible move, but it's the first step for the team down a very concerning road. If more players continue to get hurt, the Jaguars will have to continue to waive/injured players from the injured reserve. Source: SBNation.com