Through the first three weeks of the season, Cleveland’s offense is making the plays when they need them the most. The Cleveland Browns entered the 2021 season with a few known quantities on offense. A running game, headed by running backs Nick Chubb and Kareem Hunt, that is the envy of the league? Check. An offensive line that, when healthy, is among the league’s best? Check. A receiving group highlighted by production (wide receiver Amari Cooper), breakout potential (tight end David Njoku) and a whole lot of hope? Check! The only real question mark came in the form of quarterback…