Now we know for sure how Bill feels about Andrews. Unfortunately, we still don't have a backup Center who has actually played Center in the NFL.
...or in college for that matter. Though as @maineman209 noted, neither had Dan Connolly when he was the primary backup at center. (Connolly was a 4-year starting tackle for the mighty Southeast Missouri Redhawks.) It sure looks like Ted Karras's job to lose at this point.