That's the better term.
This quote is important:
"With Sullivan practicing on a limited basis for most of last season, Allen received far more practice reps than the average backup center would, without any of the pressure inherent to the position. Over the course of that time, Allen was challenged to learn every position along the offensive line, in order to better understand his role at center."He has a lot to learn and his progress will not be linear. But he's far from starting from scratch.
