What the Bears possess on the defensive edge is the understandable envy of many NFL teams. Khalil Mack, a perennial Defensive Player of the Year candidate routinely in the conversation for football’s premier faces. Robert Quinn, a former All-Pro and underrated complementary partner. A duo every pair of offensive tackles understands they’ll have to reckon with, but will somehow, as always, still be unprepared for the actual onslaught when it arrives. The Mack and Quinn together comprise Chicago’s greatest strength. The two 29-year-olds are the Bears’ roster’s strongest trump card against many an inept quarterback, and should offer a steady comfort for a good while.