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Jonathan Goodwin was a decent option for the 49ers in 2011 and he will most likely hold up for another year or two. Outside of him, the 49ers really only have Chase Beeler from Stanford. He was part of the team's practice squad last year.
One of the really nice things about good centers is that they tend to fall in the draft.
The 49ers would be lucky to have Mike Brewster fall to them in the fourth round of the 2012 NFL draft.
He is a big man, at 6'5" and 305 pounds, but Brewster stays low to the ground and knows how to maintain excellent leverage against powerful opponents. He is a technician with good lateral movement, which allows him to mirror his opponents in pass protection.
In the running game, Brewster is quick off the snap and shows some pop on his blocks. He is also mobile, which is a huge plus in the West Coast offense that asks centers to sometimes pull like a guard.
Finally, Brewster was a four-year starter for the Buckeyes. He is a leader and a good man to have in the locker room.