Bills and KC both must play late since they are competing for the #1 seed.
SF has to play at the same time as Philly for similar reasons.
Also, If Pittsburgh wins, it's unlikely they play early on Saturday because of the turnaround.
They will be motivated. Stidham wants to demonstrate he is the QB for the Raiders, and Josh McDaniel is fighting for his job potentially. They want to end their season on a positive note.