By Michael Fabiano The 49ers can’t slow down and defenses can’t slow down Christian McCaffrey either. First and foremost, I’d like to take a moment to wish Damar Hamlin a fast recovery as I know all of our thoughts are with him, his friends and family and the Bills organization. With all due respect to his health, we’re reluctantly moving forward to Week 18. Three playoff berths, two in the AFC and one in the NFC are still up for grabs. The Chiefs, Bills, Bengals, Chargers and Ravens are locked into the AFC postseason. The Eagles, 49ers, Vikings, Buccaneers, Cowboys and Giants hold the spots i…