Looks like Big Mack suffered without Hicks. I don't know if folks around here would call Hicks the most underappreciated as we understand how important he is to the D. Nobody else on D comes to mind for this category.One way to see how pressure fronts work best together is to look at the Bears last season. NGS shows that in the first three games of 2019, Khalil Mack earned a pressure on 16.4 percent of pass rushes. But then Hicks missed Week 4 with a knee injury and went on injured reserve with an elbow injury suffered in Week 5, and from Week 4 on, Mack was only able to generate pressure on 8.7 percent of pass rushes. It's worth noting that Hicks did play a little in Week 5 and came back in Week 15, so this is an imperfect measurement, but the point still stands: When offenses have to account for the potential of pressure coming from many directions, the number of double (or triple) teams decreases, and strategic play-calling can often benefit the defense. I also wrote about Hicks last season, if you want more evidence.
If you had to pick someone on offense, who would it be? I'd probably nominate Whitehair. The OL seems to get castigated as a whole yet his play remains solid. Tough to tell sometimes as others around him mess up and he has to decide to help them or stay on assignment.