ASHBURN, Va. -- After beginning Friday's draft as one of only two teams that hadn't chosen a player in Thursday's first round, the Washington Redskins waited even longer to add some talent, dropping 13 spots in a trade with Dallas while picking up a third-rounder from the Cowboys. At No. 47, the Redskins selected Stanford outside linebacker Trent Murphy, who led the nation as a senior with 15 sacks in 2013.

Bypassing possible starting right tackles and other prospects that might contribute more immediately, the Redskins lived up to general manager Bruce Allen's comment this week that they "don't have any gaping holes" despite last season's 3-13 record. Coach Jay Gruden added that Washington's productive free-agent signing period allowed the Redskins to increase their depth rather than drafting an immediate starter.

The 6-foot-5, 250-pound Murphy will begin competing with holdovers Rob Jackson and Brandon Jenkins to back up Pro Bowl outside linebackers Brian Orakpo and Ryan Kerrigan.

Orakpo, who was franchised this offseason, is due to be a free agent in 2015. Kerrigan would follow suit in 2016. Unlike Orakpo and Kerrigan, who were defensive ends in college, Murphy won't have to change positions, having played outside linebacker in Stanford's 3-4 scheme.

Gruden said Murphy could be used as an inside linebacker in nickel situations. Former inside linebacker London Fletcher, who announced the pick to the audience at Radio City Music Hall, retired after last season, his 16th in the NFL and his seventh with Washington.

"Hopefully I can find a role," said Murphy, who wasn't surprised to be chosen by Washington after he enjoyed his visit to Redskins Park earlier this spring. "I use (my) length and my hands (to get sacks). You talk to any offensive lineman I've pass rushed against, they'll talk about how well I use my hands. They can never punch or get a strike on me. ... The biggest challenge is consistency, that relentless effort every second, not just sporadically."

Gruden called Murphy "a proven pass rusher. He works his tail off. He studies the game. He's big. He's long. I look at production, intensity, toughness and accountability."

Washington made the playoffs in just one of the past six seasons, but Murphy is very happy to be a Redskin.

"Pure joy, such a sigh of relief to have this waiting game over," he said from his home in Mesa, Ariz. "It definitely felt like home there so I couldn't be more excited that's where I ended up. It shows I was high on their board. That means a lot to be a team's first pick even though it was not in the first round. I couldn't be more excited to be that guy and to put that weight on my shoulders."

The last four players chosen first by the Redskins who have played at least two NFL seasons -- quarterback Robert Griffin III (2012), Kerrigan (2011), left tackle Trent Williams (2010) and Orakpo (2009) -- were all chosen for Pro Bowls by their third seasons.

Gruden said while Washington considered taking Virginia offensive tackle Morgan Moses with the 47th pick, trading down to add a third-rounder was "a no-brainer," especially when Moses was still on the board. The 6-foot-6, 314-pound Moses played better at left tackle in 2013 than he did earlier in his career at right tackle. However, with Williams entrenched on the left side, Moses is expected to challenge underwhelming incumbent Tyler Polumbus on the right side.

While Moses has the requisite size and strength, draft experts have questioned his work ethic -- although Gruden called him a "high-motor" guy -- which likely prompted his fall to the third round for a player who was one of the 30 to be invited by the NFL to Radio City Music Hall for the draft.

"It was a crazy wait, but I'm just happy to have the opportunity to have my name called, walk across that stage and put the hat on," said Moses, a Richmond native whose youth football team was the Redskins. "It's a blessing (to be a Redskin). I want to get in there and start working right now. I feel like I have all the ability to play at the next level."

So does Nebraska guard Spencer Long, whom Washington selected with the 78th choice. The 6-foot-5, 320-pound Long started two and a half years for the Cornhuskers before an injury to his left knee ended his senior season. Long played all three inside spots, more at right guard than at the other positions. Washington signed left guard Shawn Lauvao as a free agent and moved Kory Lichtensteiger, who is 29, from that spot to center. Incumbent right guard Chris Chester is 31.

"I've been training full-go and I'm ready to hit the ground running," said the gritty Long, who said his knee is good to go for next weekend's rookie minicamp. "I have pretty good potential to make a difference."

Gruden said the Redskins simply couldn't pass up tall and talented offensive linemen like Moses and Long.

"The one thing you can't coach is length," said Gruden, who noted that he's not as down on Washington's returning offensive linemen as many were last year. "They'll contribute sooner rather than later."