It requires a measure of intelligence and composure to play center in the NFL, and Jonathan Goodwin fits the profile. He’s sharp, meticulous and, by all accounts, keeps his wits about him amid the customary mayhem on the line of scrimmage. That’s not to suggest the leader of the 49ers‘ offensive line doesn’t occasionally raise his voice. His job stretches beyond snapping the ball to Alex Smith and blocking the behemoth across from him. Goodwin also must ensure his fellow offensive linemen know their assignments and work in concert.