Here’s a look at how the Miami Dolphins (8-3) and San Francisco 49ers (7-4) match up in six key areas ahead of Sunday’s Week 13 game at Levi’s Stadium (4:05 p.m., Fox): When the Dolphins run: As the Dolphins get set to go against the NFL’s top-ranked run defense, they are coming off a discouraging game on the ground against the league’s worst run defense, the Texans.