Shazier is an All-Pro waiting to happen, a player on the cusp who has yet to put it all together in one season. The same is true of so many Steelers defenders. Nose tackle Javon Hargrave was a beast down the stretch as a rookie, beating double-teams and showing surprising pass-rush savvy. Stephon Tuitt, only 24 years old like Shazier, can play inside or out depending on the formation. Tuitt was Pittsburgh's best overall defender last season, a title that 28-year-old Cameron Heyward held in 2015. (A torn pectoral muscle ended Heyward's season in Week 10 of last year.)