The Week 18 matchup between the Bears and the Lions is not so much a rematch as a referendum on their respective trajectories. The Week 2 blowout was about who these teams were; the Week 18 is about who these teams became. Since these two teams last saw one another, they couldn't have taken more different paths.
The Lions may be eliminated from the playoffs, but that doesn't mean they don't have a say in the fate of the NFC North. The Bears have secured the division title, but the seeding of the NFC remains in the balance.