I'll make a little more of a case for Wells. A lot of folks don't realize all that a center does. He has to study about as much film as the QB. He has to know all the blocking assignments for all the linemen on every play. So he studies his own playbook and all the line play together. He has to also have his own mechanics down. He is an all around smart guy in a blocking body.
This is from NFL wiki which I think does a fine summary;
"Centers play an integral part of the offensive line and act as the primary protector of the quarterback after the snap. The center is often referred to as "the smartest person on the field next to the quarterback", in the sense that the center acts as the line's "mind". Before the snap, the center is given the responsibility of assessing the likely action of the defensive team (based on his knowledge of their defensive schemes, as well as the placement and stance of players on the field) and will then often adjust the blocking assignments of all the offensive linemen and the backfield by communicating using audible and visual signals referred to as "line calls".
On most plays, the center will snap the ball directly into the quarterback's hands. In a
shotgun formation, the center snaps the ball to the quarterback lined up several yards behind him.
After the snap, the center must block defensive players from reaching the ball carrier (on running plays) or the quarterback (on passing plays). On passing plays in particular, the center often must block
blitzing defensive players."
