Unless most of the teams in your league carry a backup defense, more than half of the league should be available to you every week. Perhaps instead of playing one above average defense every week, regardless of matchup, we should instead target the widely available waiver wire defenses with the best matchups in any particular week? You can always make exceptions if your rent-a-defense gets hot - heck, you might find a team worth starting all year by accident. Even if you don't, good matchups will continue to get greater in number as more QBs get injured or yanked as the season goes on. You can steal some points from bad weather come December. Each week I'll list the startable fantasy defenses on most waiver wires and rank them.
Week 16 Results
Kansas City (at Chicago) - 3 sacks, 3 pts against
The Chiefs defense was outstanding and has given the franchise a much more balanced team for their playoff run than the 2018 edition, but it didn’t result in a big fantasy line in Week 16. They can still get a bye or fall to the fourth seed so their D/ST will be a good play at home against Philip Rivers in the December of his career.