If they've got the division or even 1-seed locked up they may rest their starters
If we go undefeated over these next 5 games and the Chiefs lose two more games (IDK how, but it'd be funny), that matchup with the Ravens could be for the 1st Seed in the AFC.
The Seahawks might still make the playoffs even if they lose these next 3 games just because of how awful the rest of the NFC is. Vikings offense was heavily elevated by Cousins playing out of his mind, Rams still have to play the Niners and 2 AFC North teams, and the NFC South is the NFC South.
There is a non-zero chance the NFC sends 3 losing teams into the playoffs. Meanwhile, multiple 10 win teams will miss out in the AFC.