Last season Maurkice Pouncey became an All-Pro center in his rookie season. The funny thing about Maurkice's story (yes I know it's not his brother) is that he wasn't expected to even be a center this season. In fact, at the beginning of training camp Pouncey was competing—yes competing!—for a chance to get playing time at right guard.
Obviously Pouncey eventually became the starting center and the rest is history but he definitely benefited from not being under so much pressure to perform instantly.
Unlike Pouncey none of the players on this list have that option. These players are expected to perform from day one and could be the difference between a successful or disastrous season.