Mitch Trubisky made major strides on the football field in 2018. From a fantasy football perspective, Trubisky went from a non factor in 2017 to a high QB2, low QB1 in 2018.
Trubisky finished around 15th (depending on scoring) among QBs last season, but that includes the fact that he missed two games due to injury. If you look at Trubisky from a fantasy points per game perspective, he averaged 20 points per game which was good for 10th. That includes trailing Ryan Fitzpatrick who had a couple big games and only had 6 games, thus the high PPG average.