Installing a brand new blocking scheme under a new head coach and offensive line coach? Check.

Adding two new starting tackles with no preseason to field-test them? Check.

The starting center misses all of training camp? Check that box too.

Yet with all those boxes of adversity checked, the Cleveland Browns offensive line is playing very well through the first two weeks. That has helped OL coach Bill Callahan's line check another box.

Best run blocking unit in the NFL, per Pro Football Focus? Check.

There the Browns sit, at the top of the PFF run blocking grades through Week 2. At 84.3 the...