A 3rd-year cornerback who has started 36 of 37 career games played was traded from the Bills to the Eagles in the 2017 offseason. Transitioned from DC Dennis Thurman and HC Rex Ryan's heavy man blitz scheme to DC Jim Schwartz's off man/cover 3 scheme seamlessly. He has slim frame with solid height, weight, and arm length. Possesses very good athletic ability with elite acceleration and burst, very good speed, and very good jumping ability. Mirrors receivers well in off-man coverage from either an inside or outside leverage and use his acceleration to break on the receiver's route. Has elite ball skills, can maintain contact with the receiver in press man, turn his head around, locate and swat the ball away especially in red zone situations where he is elite. In off-man coverage, has the ball skills and AA to break on a short route disrupt the pass and even rip it in the air for another defender to intercept. In off zone cover 3, has the mental processing to read the QB eyes and route concepts to break on a pass that might be outside his "zone" and possesses good catching ability to intercept the ball. Has the good lateral quickness and patience to match and disrupt a receiver's angle at the LOS and has good hand placement in accordance with his leveraging once the receiver has released off the line. A very good open field tackler, despite his tendency to lower his head, closes space fast and under control and will bring down a bigger wide receiver and not be dragged for additional yards. Has marginal play strength taking on blocks and will be erased from the play by almost any blocker. Has tendency in off-man coverage to maintain too much of a cushion between him and the receiver making him susceptible in the intermediate range against a very good route running receiver. His aggressiveness in off-man coverage causes him to bite on double moves and give up big plays. An adequate run support player whose competitive toughness will make him insert himself to put himself in a position to make the tackle, but his marginal play strength makes it hard for him to shed blocks, or constrict a running lane. Overall, Ronald Darby is a Starting Outside Cornerback you can win because of by placing him in off man, cover 3, or press cover one. Has the AA and anticipation skills to break quickly on the ball from off technique. Mirrors receivers hips well and uses hands well to maintain leverage/disrupt after WR releases. Can be left on an island especially in the red zone. Very good open field tackler but lacks the play strength to take on and shed blocks. Has Elite ball skills and will routinely attack the receivers bread basket or come down with the interception himself. His acceleration and aggressiveness sometimes leads him to break on double moves giving up big gains. Will sometimes underestimate his own athletic ability and keep t0o much of a cushion between him and the WR between the 7-12 yard depth.