Robert Davis was waived last week so the Redskins could sign J.P. Holtz from the practice squad due to Jordan Reed's concussion. Washington chose to go with 5 WRs on the roster, and probably felt that their 6th WR was a safe bet to clear waivers.
Davis made an amazing comeback from a broken leg and multiple torn ligaments. He made the team after catching multiple touchdowns in the preseason. Now he gets a chance to stay with the team after clearing waivers, and stay ready for his next chance to make the 53-man roster.