Larsen is another big body lineman, who while a top Center, played in a lower level FBS conference. He does however have good speed for a Center.
Martin is a big Center, and good all around blocker, but he is on the slow side.
Stone is a big Center, good blocker, just on the slow side. Gets pushed off the line of scrimmage
Ikard played at a high level conference, the BIG 12, has a big body, but is on the slow side.
Brodine is a big center, and a good blocker, but is on the slow side
Stork played with a great Florida State offensive line, and protected, and created holes for their running backs. And good size, but not the fastest..
Richburg is a good sized Center, with decent speed. But is another player who played against lower level FBS teams.
Swanson is a big body, nasty, and mauler. He played against top level competition in the SEC. But he is on the slow side.