There's a litany of good players to choose from, but there are a select few who are truly worthy of the moniker of being irreplaceable. Joe Thomas is one player who is worth a whole lot to this team.
In 2013, Thomas protected whichever mediocre quarterback Cleveland threw behind him but always blocked as if he had Peyton Manning there.
On the other side of the ball is Joe Haden, who is largely considered to be a top-10 cornerback in this league. Haden has provided a reliable blanket of coverage for the Browns week after week, and they would've surely done worse had he not been playing.
When measuring the level of importance and irreplaceability that comes with a player, you must consider the adverse impact his absence would have on the team's output. Not only that, but also who would have to step up behind him if he was to go down with injury.
Consistency is the name of the game in the NFL, and each of these eight guys helps maintain a consistent team performance in every game.