It's all my own speculation but I believe the team's plan was to pay either Lattimore or Adebo depending on how this season played out and have McKinstry take over as a starter next season (provided he didn't look completely out of his depth, which he hasn't). The problem is with Adebo's broken femur no one has any idea what he looks like after recovery, and we haven't exactly had the best luck with injury recovery either.
That said, I do agree that if we lose Sunday they might well decide to get what they can for Lattimore now and worry about our CB room in the off-season.