NFL teams are starting to discover their identities. Analytic data is beginning to come into focus. Player injuries are piling up. It’s Week 4 of football season, and some teams, both real and fantasy, are already planning for next year. For the rest of us, the grind to stay in the win column starts as soon as the previous week’s games end. If you’re only rostering the Ravens D/ST, and you’re staring at a scary potential shootout with the Bills, you’re in the right place. Let’s take a look at the waiver wire for the best defenses to stream this week.