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The 2017 Cleveland Browns' success will be because of how both of their lines play. The Browns spent most of their off-season addressing the Offensive line in free agency and the Defensive line during the draft.
Outside of the starting five the Browns have have a lot of versatility on the offensive line. Cam Erving has played every o-line position during his football career. John Greco has been the starting right guard for the past five seasons. Greco has also shown an ability to play center if need be. The Browns also have Spencer Drango who played and started a number of games last season in place of Bitonio. And during the draft the Browns traded up for Rod Johnson, a left tackle out of Florida State. If anything, Johnson might become a practice squad, stash and then develop for a year or so.
Offensive Line Outlook: They will definitely be improved from last season. "IF" everyone stays healthy they could possibly be one of the best offensive line in the NFL. And if rookie quarterback Deshone Kizer starts, this offensive line shouldn't give Hue Jackson and company anything to be worried about.
Unfortunately, with all those guys as potential locks it doesn't leave much room for guys like Nate Orchard and Xavier Cooper. Both were part of the 2015 draft. Nate Orchard was a second round pick, but in his first two seasons he's battled injuries and playing as a 3-4 outside linebacker. He's in the same situation as Ogbah but might not get the benefit of the doubt because he was drafted by the previous regime.
Defensive Line Outlook: The defensive line is kind of hard to predict. Do they have the talent? Yes. But they are extremely young. And the success of a D-Line goes hand-in-hand with the success of the defensive backs and vise-versa. So if the line plays well, then overall the defense will be pretty good. And with Gregg Williams at the helm, its hard to see them not playing well for 16 games.