If we had acquired JB, let's not act like he would've won the Heisman here, been playing for the natty or even had the season he's had. We also would've needed the supporting cast. I think it's silly to bemoan the fact of what happened. He's probably a fairly average QB if he plays at Nebraska.
I would agree he likely doesn't win the Heisman, but I don't think there is much doubt that he would of been better than "fairly average" for Nebraska in 2019. A 3-4 win improvement with the 2019 version of Burrow would be my guess.