Mitch Trubisky regressed in 2019 and had a poor year. There are plenty of factors including offensive line, tight end, and play calling, but overall, Trubisky carries the blame. While he suffered a shoulder injury in Week three against the Minnesota Vikings, it was to his non-throwing shoulder. He played through it and it cannot absolve him of throwing issues.
However, it may have held him back running the football. Trubisky had 68 rushing attempts for 421 yards in 2018. It was a true factor and added to the run game. He had 48 rushes for 193 yards in 2019.