By Andrew Holleran The Seattle Seahawks have reportedly added to their running back depth. According to a report from NFL Network insider Ian Rapoport, the Seahawks are bringing back a former first round running back selection. Rapoport reports that the Seahawks have signed Rashaad Penny. “The Seahawks are in agreement on a 1-year deal with one of their own — RB Rashaad Penny. The former first-rounder turned down more money elsewhere to build off his stellar second half of 2021. He gets $5.75M with ability to earn up to $6.5M,” he reports. Penny, 26, rushed for 749 yards and six touchdowns las…