19. Bobby Massie
Massie started off slow initially after his signing. However, as the season went on it appeared that he began to grasp the offense, his role and the players around him. As the year went on he slowly became better and became a relied on player.
Massie is not one of the elite right tackles in the NFL, but he is so valuable to the Bears because he is the best tackle on the team. By the end of the season, there was no doubt that Charles Leno was a bigger liability than Massie. Of the two, Massie is more likely to take a step forward this year than Leno.
If Massie can take that step forward, the offensive line is going to be in really good shape. If he were to go down or struggle even more this season, the offensive line could arguably be a weak point on the team. The range of outcomes in which Massie has control over is why his 2017 season is so much more important than others.