A few weeks into any NFL season, it always becomes a war of attrition. The team with healthy stars is the team that becomes the betting favorite, even if it would be a lopsided matchup in the other direction in week 1.
The Bears have been burned by injuries plenty of times; just a few recent examples include Jay Cutler in the NFC Championship Game, Akiem Hicks in 2019, Tarik Cohen in 2020, and Kevin White nearly the entire time he was with the Bears.
David Montgomery is the fresh news, though. The Bears have been so desperate for any type of identity on offense, and seemed to finally find one last Sunday, with Monty going off for 106 rushing yards and 2 touchdowns before hurting his knee in the 4th quarter.