The Facts: Carson is retiring from the NFL due to a neck injury, sources tell NFL Network's Ian Rapoport.

Diehards Line: Carson won't make a retirement statement, just in case his neck dramatically improves, but Seattle will officially release Carson with a failed physical designation. Under the CBA, that allows Carson to receive several million in injury protection benefits. Seattle does right by him and opens the door for Rashaad Penny and Kenneth Walker III to compete for carries in training camp. Penny has the edge going in, but.