Davis needed to be active for 12 games this season in order to collect a $500,000 bonus. The initial reason for that bonus was because of Davis' Achilles' injury that ended is 2012 season. The Redskins wanted to protect themselves if he couldn't play much this season -- and reward him if he could. Davis has been a healthy inactive the past four games; he sat out one game because of a sprained ankle.
The emergence of rookie Jordan Reed, who leads all NFL rookies with 38 receptions, and the fact that Davis does not play special teams have kept him inactive. Niles Paul is actually the fourth tight end, but he is active because of his special-teams performance.