Maybe he is a bust as a pocket passer and "thats that".
Fields is a bust. Bad field vision, bad decision making all the time.
He cannot see the defensive alignment and then get the ball ON SCHEDULE (2.7 seconds according to Tom Brady), he dances in and out of the pocket and gets sacked or hurried or deflected way too often. His OSU offense was not a pocket passing offense, they bullied teams with a great OL and used the run to control the game then Fields could throw to wide open elite speedy future NFL wide receivers that were going against single coverage.
Sure the Bears can win a few if they tell him to run first but he will get dinged and injured, it is inevitable.
Owners are foolishly going for the new "athletic" QBs and that is a very bad strategy.
They should draft QBs who were on NFL style pocket passing offenses and started there at least two years. There is a long list of busts for so called athletic scramble and run too often QBs and Field and Lance are being added to that list, so will Richardson, eventually. I do not put Young in this category, by the way.