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Kevin Fishbain and Adam Jahns of The Athletic report that several NFL insiders have concerns about the throwing mechanics and throwing motion of Chicago Bears quarterback Justin Fields.

One league source told Fishbain and Jahns that he can be good. How long will it take?

Fields had his ups and downs in his first season, throwing for 1,870 yards, seven touchdown and 10 interceptions in 10 games while completing just 58.9 percent of his passes. He finished a disappointing 2-8 as the team's starter after rushing for over 400 yards and two scores.

The veteran pair of Andy and Nick were 4-3 in their starts.

Some of the struggles of Fields could be attributed to the scheme and influence of Matt Nagy.

The person told Fishbain and Jahns what Charles Leno did after he left Chicago. The guys had success in different offenses.

Leno, who signed a three-year, $37.5 million extension with the Washington Commanders in January, helped anchor an offensive line from his left tackle position that finished sixth in PFF's overall pass-blocking grades.

The Atlanta Falcons had a career year from a hybrid running back and wide receiver, as well as a career year from a running back and wide receiver.

Whether leaving a Nagy-led team was the primary reason for both players showing improvement in 2021, or simply playing for schemes that better suited their skill sets is debatable. It remains to be seen if Fields will take strides under new head coach Matt Eberflus, new offensive coordinatorluke Getsy and new quarterbacks coach Andrew Janocko.

Eberflus told reporters that he would build the offense around him and his strengths. I don't know. We need to look at him. We need to evaluate him. We need to know where his skill set is. Then look at his camera. How does he see the game? How quickly does he process? How can we stretch him as we go?

A lot of change for a young player. Their primary goal is to get the most out of their young quarterback. If Fields doesn't take a step forward, questions will emerge as to whether he's a true franchise quarterback in the making.