Keith Gillett/IconSportswire
HEIGHT: 5'11"
WEIGHT: 205
POSITIVES
— Stout run-first defender who isn't afraid to bang around with offensive linemen. Castro aligns all over the field for the Hawkeye defense, primarily in the box and at the nickel spot.
— High-motor player with tenacity to get to the ball who triggers extremely quickly to the run. Comes screaming downhill looking for contact, closing in with good angles.
— Lacks elite twitch, but his footwork in coverage is clean, showing above-average feet and hips to drive on the ball.