The news came in before 9:00 AM Eastern Time Saturday but it quickly rocked the NFL world when it was learned the Chicago Bears had acquired pass rushing phenom Khalil Mack from the Oakland Raiders for what is reportedly two first-round picks and perhaps something more. Considered the best pure pass rusher in football, Mack by himself instantly transforms the Bears defense from a very solid unit to one that could be great. Already possessing prized rookie Roquan Smith and Pro Bowler Leonard Floyd at linebacker, the Bears are also very stout on the defensive line with Akiem Hicks (8.5 sacks) and now Mack coming aboard. In short, the Bears are going to be a pass rushing unit that will have few peers in the NFL after adding Mack and if they were not drafted at this point in your league, do yourself a favor and pick them up. While the Week 1 matchup versus Green Bay is one that should be avoided, picking up the Bears defense and stashing them for a week is a good idea if you have a deep enough roster. The pieces are now all there for the Bears to put forth a monster defense and Mack will only enhance their potential going forward in a major way.